{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T14:28:56Z","timestamp":1781188136041,"version":"3.54.1"},"reference-count":166,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2021,5,8]],"date-time":"2021-05-08T00:00:00Z","timestamp":1620432000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100005825","name":"National Institute of Food and Agriculture","doi-asserted-by":"publisher","award":["PEN04653, Accession No. 1016510"],"award-info":[{"award-number":["PEN04653, Accession No. 1016510"]}],"id":[{"id":"10.13039\/100005825","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100005825","name":"National Institute of Food and Agriculture","doi-asserted-by":"publisher","award":["2019-70006-30440"],"award-info":[{"award-number":["2019-70006-30440"]}],"id":[{"id":"10.13039\/100005825","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006102","name":"Northeast SARE","doi-asserted-by":"publisher","award":["GNE20-234-34268"],"award-info":[{"award-number":["GNE20-234-34268"]}],"id":[{"id":"10.13039\/100006102","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Reducing risk from pesticide applications has been gaining serious attention in the last few decades due to the significant damage to human health, environment, and ecosystems. Pesticide applications are an essential part of current agriculture, enhancing cultivated crop productivity and quality and preventing losses of up to 45% of the world food supply. However, inappropriate and excessive use of pesticides is a major rising concern. Precision spraying addresses these concerns by precisely and efficiently applying pesticides to the target area and substantially reducing pesticide usage while maintaining efficacy at preventing crop losses. This review provides a systematic summary of current technologies used for precision spraying in tree fruits and highlights their potential, briefly discusses factors affecting spraying parameters, and concludes with possible solutions to reduce excessive agrochemical uses. We conclude there is a critical need for appropriate sensing techniques that can accurately detect the target. In addition, air jet velocity, travel speed, wind speed and direction, droplet size, and canopy characteristics need to be considered for successful droplet deposition by the spraying system. Assessment of terrain is important when field elevation has significant variability. Control of airflow during spraying is another important parameter that needs to be considered. Incorporation of these variables in precision spraying systems will optimize spray decisions and help reduce excessive agrochemical applications.<\/jats:p>","DOI":"10.3390\/s21093262","type":"journal-article","created":{"date-parts":[[2021,5,10]],"date-time":"2021-05-10T02:54:58Z","timestamp":1620615298000},"page":"3262","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":61,"title":["Opportunities and Possibilities of Developing an Advanced Precision Spraying System for Tree Fruits"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8141-105X","authenticated-orcid":false,"given":"Md Sultan","family":"Mahmud","sequence":"first","affiliation":[{"name":"Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16802, USA"},{"name":"Fruit Research and Extension Center, The Pennsylvania State University, Biglerville, PA 17307, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6202-8680","authenticated-orcid":false,"given":"Azlan","family":"Zahid","sequence":"additional","affiliation":[{"name":"Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16802, USA"},{"name":"Fruit Research and Extension Center, The Pennsylvania State University, Biglerville, PA 17307, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Long","family":"He","sequence":"additional","affiliation":[{"name":"Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16802, USA"},{"name":"Fruit Research and Extension Center, The Pennsylvania State University, Biglerville, PA 17307, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0967-826X","authenticated-orcid":false,"given":"Phillip","family":"Martin","sequence":"additional","affiliation":[{"name":"Fruit Research and Extension Center, The Pennsylvania State University, Biglerville, PA 17307, USA"},{"name":"Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University, University Park, PA 16803, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,8]]},"reference":[{"key":"ref_1","unstructured":"USDA-NASS (2018). Noncitrus Fruits and Nuts: 2017 Summary."},{"key":"ref_2","unstructured":"Oerke, E.C., Dehne, H.W., Sch\u00f6nbeck, F., and Weber, A. (1994). Crop Production and Crop Protection: Estimated Losses in Major Food and Cash Crops, Elsevier Science."},{"key":"ref_3","unstructured":"Weinzierl, R. (2015). Insect Management Updates for Apples, University of Illinois."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"362","DOI":"10.1289\/ehp.96104362","article-title":"The agricultural health study","volume":"104","author":"Alavanja","year":"1996","journal-title":"Environ. Health Perspect."},{"key":"ref_5","unstructured":"Deveau, J. (2020, May 04). Six Elements of Effective Spraying in Orchards and Vineyards, Available online: http:\/\/www.omafra.gov.on.ca\/english\/crops\/facts\/09-039.htm."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"333","DOI":"10.13031\/2013.28344","article-title":"Downwind residues from spraying a semi-dwarf apple orchard","volume":"36","author":"Fox","year":"1993","journal-title":"Trans. ASAE"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Devisetty, B.N., Chasin, D.G., and Berger, P.D. (1993). Adjuvants to Reduce Drift from Handgun Spray Applications. Pesticide Formulations and Application Systems: Twelfth Volume, ASTM International.","DOI":"10.1520\/STP1146-EB"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1007\/s10341-018-0387-5","article-title":"Comparative energy use efficiency and economic analysis of apple production in Turkey: Case of thrace region","volume":"61","author":"Hurma","year":"2019","journal-title":"Erwerbs-Obstbau"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1007\/s10341-015-0242-x","article-title":"Economic analysis of pesticides applications in apple orchards in west mediterranean region of Turkey","volume":"57","author":"Yilmaz","year":"2015","journal-title":"Erwerbs-Obstbau"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"245","DOI":"10.1007\/s11370-010-0074-3","article-title":"Comprehensive automation for specialty crops: Year 1 results and lessons learned","volume":"3","author":"Singh","year":"2010","journal-title":"Intell. Serv. Robot."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Pimentel, D., and Burgess, M. (2014). Environmental and Economic Costs of the Application of Pesticides Primarily in the United States. Integrated Pest Management, Springer Science & Business Media.","DOI":"10.1007\/978-94-007-7796-5_2"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1181","DOI":"10.13031\/trans.59.11760","article-title":"Evaluation of a laser scanning sensor in detection of complex-shaped targets for variable-rate sprayer development","volume":"59","author":"Liu","year":"2016","journal-title":"Trans. ASABE"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1007\/s11119-013-9319-4","article-title":"Spot-application of fungicide for wild blueberry using an automated prototype variable rate sprayer","volume":"15","author":"Esau","year":"2014","journal-title":"Precis. Agric."},{"key":"ref_14","first-page":"587","article-title":"Design and testing of an ultrasound system for targeted spraying in orchards","volume":"57","author":"Stajnko","year":"2011","journal-title":"Stroj. Vestn. J. Mech. Eng."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"431","DOI":"10.1016\/j.compag.2019.04.040","article-title":"Site-specific orchard sprayer equipped with machine vision for chemical usage management","volume":"162","author":"Asaei","year":"2019","journal-title":"Comput. Electron. Agric."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"3207","DOI":"10.1094\/PDIS-04-20-0696-RE","article-title":"Evaluation of the intelligent sprayer system in peach production","volume":"104","author":"Boatwright","year":"2020","journal-title":"Plant Dis."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"385","DOI":"10.1007\/s40030-018-0289-4","article-title":"Real-time variable rate spraying in orchards and vineyards: A review","volume":"99","author":"Wandkar","year":"2018","journal-title":"J. Inst. Eng. Ser. A"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"319","DOI":"10.1080\/10798587.2015.1015781","article-title":"Technology application of smart spray in agriculture: A review","volume":"21","author":"Song","year":"2015","journal-title":"Intell. Autom. Soft Comput."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1016\/j.compag.2016.04.018","article-title":"Development of alternative plant protection product application techniques in orchards, based on measurement sensing systems: A review","volume":"124","author":"Berk","year":"2016","journal-title":"Comput. Electron. Agric."},{"key":"ref_20","unstructured":"Lodeman, E.G. (1916). The Spraying of Plants, The MacMillan Co."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"716","DOI":"10.1093\/jee\/39.6.716","article-title":"Particle size of insecticides and its relation to application, distribution, and deposit","volume":"39","author":"Potts","year":"1946","journal-title":"J. Econ. Entomol."},{"key":"ref_22","unstructured":"Rose, G.E. (1955). Crop Protection, Leonard Hill."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1146\/annurev.en.01.010156.001325","article-title":"Apparatus for application of insecticides","volume":"1","author":"Brann","year":"1956","journal-title":"Annu. Rev. Entomol."},{"key":"ref_24","unstructured":"Fleming, G.A. (1962). The Relationship of Air Volume, Air Velocity and Droplet Size to the Efficiency of Spray Transport in Airblast Spraying. [Ph.D. Thesis, Cornell University]."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/S0021-8634(71)80002-1","article-title":"The relationships between air volume and pressure on spray distribution in fruit trees","volume":"16","author":"Randall","year":"1971","journal-title":"Ournal Agric. Eng. Res."},{"key":"ref_26","unstructured":"Chen, Y. (2010). Development of an Intelligent Sprayer to Optimize Pesticide Applications in Nurseries and Orchards. [Ph.D. Thesis, The Ohio State University]."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"606","DOI":"10.1094\/PD-71-0606","article-title":"Effects of travel speed, application volume, and nozzle arrangement on deposition of pesticides in apple trees","volume":"71","author":"Travis","year":"1987","journal-title":"Plant. Dis."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1381","DOI":"10.13031\/2013.28744","article-title":"Air jet velocities from a cross-flow fan sprayer","volume":"35","author":"Fox","year":"1992","journal-title":"Trans. ASAE"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"709","DOI":"10.13031\/2013.28131","article-title":"Tunnel sprayer for dwarf fruit trees","volume":"37","author":"Peterson","year":"1994","journal-title":"Trans. ASAE"},{"key":"ref_30","unstructured":"Siegfried, W., and Holliger, E. (1996). Application Technology in Fruit-Growing and Viticulture. Field Trial Report, Swiss Federal Research Station."},{"key":"ref_31","first-page":"285","article-title":"Relationship between orchard tree crop structure and performance characteristics of an axial fan sprayer","volume":"57","author":"Walklate","year":"2000","journal-title":"Asp. Appl. Biol."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"405","DOI":"10.13031\/2013.24375","article-title":"A history of air-blast sprayer development and future prospects","volume":"51","author":"Fox","year":"2008","journal-title":"Trans. ASABE"},{"key":"ref_33","first-page":"15","article-title":"Patternation of spray mass flux from axial fan airblast sprayers in the orchard","volume":"46","author":"Cross","year":"1991","journal-title":"Br. Crop Prot. Counc. Monogr."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"545","DOI":"10.1016\/j.cropro.2007.08.012","article-title":"Targeted spray technology to reduce pesticide in runoff from dormant orchards","volume":"27","author":"Brown","year":"2008","journal-title":"Crop. Prot."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"515","DOI":"10.1002\/ps.2780120508","article-title":"Spray retention and distribution on apple trees","volume":"12","author":"Herrington","year":"1981","journal-title":"Pestic. Sci."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1016\/S0261-2194(99)00060-5","article-title":"Off target ground deposits from spraying a semi-dwarf orchard","volume":"18","author":"Vercruysse","year":"1999","journal-title":"Crop Prot."},{"key":"ref_37","first-page":"25","article-title":"Agricultural electrostatic spray application: A review of significant research and development during the 20th century","volume":"51","year":"2001","journal-title":"J. Electrostat."},{"key":"ref_38","first-page":"1","article-title":"Studies on the distribution of spray deposits in the crown of apple trees of different crown volume as a contribution to the harmonisation of dosage of plant protection products","volume":"135","author":"Martin","year":"1998","journal-title":"Newsl. Ger. Mag. Orchard. vineyards"},{"key":"ref_39","first-page":"353","article-title":"Expression of dose rate with respect to orchard sprayer function","volume":"66","author":"Weisser","year":"2002","journal-title":"Asp. Appl. Viology"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1111\/j.1365-2338.2001.tb00983.x","article-title":"Registration of plant protection products in EPPO countries: Current status and possible approaches to harmonization","volume":"31","author":"Siegfried","year":"2001","journal-title":"EPPO Bull."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1111\/j.1744-7348.2003.tb00264.x","article-title":"A generic method of pesticide dose expression: Application to broadcast spraying of apple trees","volume":"143","author":"Walklate","year":"2003","journal-title":"Ann. Appl. Biol."},{"key":"ref_42","unstructured":"Feng, J., and He, L. (August, January 29). Tree canopy estimation for mechanical pruning based on 3D lidar. Proceedings of the in Northeast Agricultural Biological Engineering Conference, Morgantown, WV, USA. Paper No. 18-054."},{"key":"ref_43","first-page":"1","article-title":"Pesticide dose adjustment in vineyard spraying and potential for dose reduction","volume":"X","author":"Pergher","year":"2008","journal-title":"Agric. Eng. Int. CIGR J."},{"key":"ref_44","first-page":"6373","article-title":"Comparison effectiveness of canopy volume measurements of citrus species via arduino based ultrasonic sensor and image analysis techniques","volume":"26","author":"Beyaz","year":"2017","journal-title":"Fresenius Environ. Bull."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"777","DOI":"10.13031\/2013.28846","article-title":"A laser scanner based measurement system for quantification of citrus tree geometric characteristics","volume":"25","author":"Lee","year":"2009","journal-title":"Appl. Eng. Agric."},{"key":"ref_46","first-page":"224","article-title":"Laser measurement and experiment of hilly fruit tree canopy volume","volume":"44","author":"Yu","year":"2013","journal-title":"Trans. Chinese Soc. Agric. Mach."},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Mahmud, M.S., Zahid, A., He, L., Choi, D., Krawczyk, G., Zhu, H., and Heinemann, P. (2021). Development of a LiDAR-guided section-based tree canopy density measurement system for precision spray applications. Comput. Electron. Agric., 182.","DOI":"10.1016\/j.compag.2021.106053"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"450","DOI":"10.1016\/j.biosystemseng.2020.10.016","article-title":"An algorithm to automate the filtering and classifying of 2D LiDAR data for site-specific estimations of canopy height and width in vineyards","volume":"200","author":"Naud","year":"2020","journal-title":"Biosyst. Eng."},{"key":"ref_49","first-page":"1263","article-title":"Spray deposition inside tree canopies from a newly developed variable-rate air-assisted sprayer","volume":"56","author":"Chen","year":"2013","journal-title":"Trans. ASABE"},{"key":"ref_50","first-page":"342","article-title":"An evaluation of an apple canopy density mapping system for a variable-rate sprayer","volume":"52","author":"Hu","year":"2019","journal-title":"IFAC Pap."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Li, H., Zhai, C., Weckler, P., Wang, N., Yang, S., and Zhang, B. (2017). A canopy density model for planar orchard target detection based on ultrasonic sensors. Sensors, 17.","DOI":"10.3390\/s17010031"},{"key":"ref_52","first-page":"570","article-title":"Retrieval of the leaf area density of Magnolia woody canopy with terrestrial Laser-scanning data","volume":"20","author":"Wang","year":"2016","journal-title":"Yaogan Xuebao J. Remote Sens."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"284","DOI":"10.1016\/j.compag.2019.02.012","article-title":"Evaluation of mobile 3D light detection and ranging based canopy mapping system for tree fruit crops","volume":"158","author":"Chakraborty","year":"2019","journal-title":"Comput. Electron. Agric."},{"key":"ref_54","doi-asserted-by":"crossref","unstructured":"B\u00e9land, M., and Kobayashi, H. (2021). Mapping forest leaf area density from multiview terrestrial lidar. Methods Ecol. Evol.","DOI":"10.1111\/2041-210X.13550"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"105158","DOI":"10.1016\/j.compag.2019.105158","article-title":"Digital evaluation of leaf area of an individual tree canopy in the apple orchard using the LIDAR measurement system","volume":"169","author":"Berk","year":"2020","journal-title":"Comput. Electron. Agric."},{"key":"ref_56","first-page":"958","article-title":"Review of indirect methods for leaf area index measurement","volume":"20","author":"Yan","year":"2016","journal-title":"Yaogan Xuebao J. Remote Sens."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"290","DOI":"10.1007\/s11119-012-9295-0","article-title":"Leaf area index estimation in vineyards using a ground-based LiDAR scanner","volume":"14","author":"Llorens","year":"2013","journal-title":"Precis. Agric."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"881","DOI":"10.1007\/s11119-019-09699-x","article-title":"Leaf Area Index evaluation in vineyards using 3D point clouds from UAV imagery","volume":"21","author":"Comba","year":"2020","journal-title":"Precis. Agric."},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Indirabai, I., Nair, M.V.H., Nair, J.R., and Nidamanuri, R.R. (2020). Direct estimation of leaf area index of tropical forests using LiDAR point cloud. Remote Sens. Appl. Soc. Environ., 18.","DOI":"10.1016\/j.rsase.2020.100295"},{"key":"ref_60","doi-asserted-by":"crossref","unstructured":"Zhang, Z., Wang, X., Lai, Q., and Zhang, Z. (2018). Review of variable-rate sprayer applications based on real-time sensor technologies. Automation in Agriculture: Securing Food Supplies for Future Generations, InTech Publishing.","DOI":"10.5772\/intechopen.73622"},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"2259","DOI":"10.1016\/S0031-3203(00)00149-7","article-title":"Color image segmentation: Advances and prospects","volume":"34","author":"Cheng","year":"2001","journal-title":"Pattern Recognit."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"158","DOI":"10.1016\/j.agwat.2014.08.010","article-title":"Study and comparison of color models for automatic image analysis in irrigation management applications","volume":"151","year":"2015","journal-title":"Agric. Water Manag."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1016\/j.compag.2007.05.008","article-title":"Autonomous robotic weed control systems: A review","volume":"61","author":"Slaughter","year":"2008","journal-title":"Comput. Electron. Agric."},{"key":"ref_64","doi-asserted-by":"crossref","unstructured":"Slaughter, D.C. (2014). The Biological Engineer: Sensing the Difference between Crops and Weeds. Proceedings of the in Automation: The Future of Weed Control in Cropping Systems, Springer.","DOI":"10.1007\/978-94-007-7512-1_5"},{"key":"ref_65","doi-asserted-by":"crossref","unstructured":"Weis, M., and S\u00f6kefeld, M. (2010). Detection and Identification of Weeds. Proceedings of the in Precision Crop Protection-The Challenge and Use of Heterogeneity, Springer.","DOI":"10.1007\/978-90-481-9277-9_8"},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1016\/j.compag.2016.12.002","article-title":"An intelligent precision orchard pesticide spray technique based on the depth-of-field extraction algorithm","volume":"133","author":"Xiao","year":"2017","journal-title":"Comput. Electron. Agric."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"105412","DOI":"10.1016\/j.compag.2020.105412","article-title":"A spraying path planning algorithm based on colour-depth fusion segmentation in peach orchards","volume":"173","author":"Gao","year":"2020","journal-title":"Comput. Electron. Agric."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"611","DOI":"10.21273\/JASHS.132.5.611","article-title":"Assessing nitrogen and potassium deficiencies in olive orchards through discriminant analysis of hyperspectral data","volume":"132","year":"2007","journal-title":"J. Am. Soc. Hortic. Sci."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/j.compag.2011.03.004","article-title":"Visible-near infrared spectroscopy for detection of Huanglongbing in citrus orchards","volume":"77","author":"Sankaran","year":"2011","journal-title":"Comput. Electron. Agric."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"106","DOI":"10.1016\/j.compag.2012.12.002","article-title":"Comparison of two aerial imaging platforms for identification of Huanglongbing-infected citrus trees","volume":"91","author":"Sankaran","year":"2013","journal-title":"Comput. Electron. Agric."},{"key":"ref_71","first-page":"55","article-title":"A hybrid of cooperative particle swarm optimization and cultural algorithm for neural fuzzy networks and its prediction applications","volume":"39","author":"Lin","year":"2008","journal-title":"IEEE Trans. Syst. Man Cybern. Part. C Appl. Rev."},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"27","DOI":"10.5565\/rev\/elcvia.826","article-title":"A novel angular texture pattern (ATP) extraction method for crop and weed discrimination using curvelet transformation","volume":"15","author":"Prema","year":"2016","journal-title":"ELCVIA Electron. Lett. Comput. Vis. Image Anal."},{"key":"ref_73","unstructured":"Rosipal, R., and Trejo, L.J. (2001). Kernel partial least squares regression in RKHS: Theory and empirical comparison. Univ. Paisley, 97\u2013123."},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1109\/MCI.2018.2840738","article-title":"Recent trends in deep learning based natural language processing","volume":"13","author":"Young","year":"2018","journal-title":"IEEE Comput. Intell. Mag."},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1016\/j.compag.2018.02.016","article-title":"Deep learning in agriculture: A survey","volume":"147","author":"Kamilaris","year":"2018","journal-title":"Comput. Electron. Agric."},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"436","DOI":"10.1038\/nature14539","article-title":"Deep learning","volume":"521","author":"LeCun","year":"2015","journal-title":"Nature"},{"key":"ref_77","doi-asserted-by":"crossref","first-page":"1345","DOI":"10.1109\/TKDE.2009.191","article-title":"A survey on transfer learning","volume":"22","author":"Pan","year":"2010","journal-title":"IEEE Trans. Knowl. Data Eng."},{"key":"ref_78","doi-asserted-by":"crossref","first-page":"339","DOI":"10.1016\/j.compag.2018.12.048","article-title":"Development and evaluation of a low-cost and smart technology for precision weed management utilizing artificial intelligence","volume":"157","author":"Partel","year":"2019","journal-title":"Comput. Electron. Agric."},{"key":"ref_79","doi-asserted-by":"crossref","unstructured":"Seol, J., Kim, J., and Son, H. (2021). Il Field Evaluations of A Deep Learning-based Intelligent Spraying Robot with Flow Control for Pear Orchards, Cornell University Press. arXiv preprint arXiv:2102.07313.","DOI":"10.1007\/s11119-021-09856-1"},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"21986","DOI":"10.1109\/ACCESS.2021.3056082","article-title":"Identification of fruit tree pests with deep learning on embedded drone to achieve accurate pesticide spraying","volume":"9","author":"Chen","year":"2021","journal-title":"IEEE Access"},{"key":"ref_81","doi-asserted-by":"crossref","first-page":"627","DOI":"10.1016\/j.compag.2018.12.022","article-title":"Disparity map computation of tree using stereo vision system and effects of canopy shapes and foliage density","volume":"156","author":"Khojastehpour","year":"2019","journal-title":"Comput. Electron. Agric."},{"key":"ref_82","unstructured":"Ni, Z., and Burks, T.F. (2013, January 21\u201324). Plant or tree reconstruction based on stereo vision. Proceedings of the 2013 American Society Agricultural Biological English Annual International Meeting, Kansas City, MO, USA. ASABE 2013."},{"key":"ref_83","doi-asserted-by":"crossref","unstructured":"Xu, C., Lu, Z., Xu, G., Feng, Z., Tan, H., and Zhang, H. (2015). 3D reconstruction of tree-crown based on the uav aerial images. Math. Probl. Eng., 2015.","DOI":"10.1155\/2015\/318619"},{"key":"ref_84","first-page":"1083","article-title":"Spray distribution and recovery in citrus application with a recycling sprayer","volume":"44","author":"Salyani","year":"2001","journal-title":"Trans. ASAE"},{"key":"ref_85","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1007\/BF03356338","article-title":"Design and testing of an automated system for targeted spraying in orchards","volume":"117","author":"Stajnko","year":"2010","journal-title":"J. Plant Dis. Prot."},{"key":"ref_86","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1016\/j.biosystemseng.2015.12.004","article-title":"Selective spraying of grapevines for disease control using a modular agricultural robot","volume":"146","author":"Oberti","year":"2016","journal-title":"Biosyst. Eng."},{"key":"ref_87","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1007\/s11370-010-0078-z","article-title":"Grape clusters and foliage detection algorithms for autonomous selective vineyard sprayer","volume":"3","author":"Berenstein","year":"2010","journal-title":"Intell. Serv. Robot."},{"key":"ref_88","doi-asserted-by":"crossref","first-page":"219","DOI":"10.1016\/j.compag.2019.02.007","article-title":"Development of an artificial cloud lighting condition system using machine vision for strawberry powdery mildew disease detection","volume":"158","author":"Mahmud","year":"2019","journal-title":"Comput. Electron. Agric."},{"key":"ref_89","doi-asserted-by":"crossref","first-page":"482","DOI":"10.1016\/j.compag.2019.04.035","article-title":"Detection of nutrition deficiencies in plants using proximal images and machine learning: A review","volume":"162","author":"Barbedo","year":"2019","journal-title":"Comput. Electron. Agric."},{"key":"ref_90","doi-asserted-by":"crossref","first-page":"965","DOI":"10.13031\/2013.27914","article-title":"Effective criteria for weed identification in wheat fields using machine vision","volume":"38","author":"Zhang","year":"1995","journal-title":"Trans. ASAE"},{"key":"ref_91","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1094\/PDIS-03-15-0340-FE","article-title":"Plant disease detection by imaging sensors\u2013parallels and specific demands for precision agriculture and plant phenotyping","volume":"100","author":"Mahlein","year":"2016","journal-title":"Plant. Dis."},{"key":"ref_92","first-page":"11","article-title":"A system for adjusting the spray application to the target characteristics","volume":"8","author":"Balsari","year":"2008","journal-title":"Agric. Eng. Int. CIGR Ejournal"},{"key":"ref_93","doi-asserted-by":"crossref","first-page":"173","DOI":"10.13031\/2013.15887","article-title":"Effects of foliage density and ground speed on ultrasonic measurement of citrus tree volume","volume":"20","author":"Zaman","year":"2004","journal-title":"Appl. Eng. Agric."},{"key":"ref_94","unstructured":"(2020, October 14). NDK. Available online: https:\/\/www.ndk.com\/en\/sensor\/ultrasonic\/index.html."},{"key":"ref_95","doi-asserted-by":"crossref","first-page":"15500","DOI":"10.3390\/s121115500","article-title":"Programmable ultrasonic sensing system for targeted spraying in orchards","volume":"12","author":"Stajnko","year":"2012","journal-title":"Sensors"},{"key":"ref_96","first-page":"1","article-title":"Application of light detection and ranging and ultrasonic sensors to high-throughput phenotyping and precision horticulture: Current status and challenges","volume":"5","author":"Molin","year":"2018","journal-title":"Hortic. Res."},{"key":"ref_97","doi-asserted-by":"crossref","first-page":"367","DOI":"10.13031\/2013.8587","article-title":"Investigation of laser and ultrasonic ranging sensors for measurements of citrus canopy volume","volume":"18","author":"Tumbo","year":"2002","journal-title":"Appl. Eng. Agric."},{"key":"ref_98","doi-asserted-by":"crossref","first-page":"467","DOI":"10.1007\/s11119-005-4243-x","article-title":"Performance of an ultrasonic tree volume measurement system in commercial citrus groves","volume":"6","author":"Zaman","year":"2005","journal-title":"Precis. Agric."},{"key":"ref_99","doi-asserted-by":"crossref","first-page":"331","DOI":"10.13031\/2013.18448","article-title":"Variable rate nitrogen application in Florida citrus based on ultrasonically-sensed tree size","volume":"21","author":"Zaman","year":"2005","journal-title":"Appl. Eng. Agric."},{"key":"ref_100","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1016\/j.compag.2004.10.002","article-title":"Software development for real-time ultrasonic mapping of tree canopy size","volume":"47","author":"Schumann","year":"2005","journal-title":"Comput. Electron. Agric."},{"key":"ref_101","doi-asserted-by":"crossref","first-page":"108","DOI":"10.1016\/j.compag.2015.05.014","article-title":"Real time canopy density estimation using ultrasonic envelope signals in the orchard and vineyard","volume":"115","author":"Palleja","year":"2015","journal-title":"Comput. Electron. Agric."},{"key":"ref_102","doi-asserted-by":"crossref","first-page":"2459","DOI":"10.3390\/s110302459","article-title":"Performance of an ultrasonic ranging sensor in apple tree canopies","volume":"11","author":"Planas","year":"2011","journal-title":"Sensors"},{"key":"ref_103","doi-asserted-by":"crossref","first-page":"1624","DOI":"10.13031\/2013.30614","article-title":"Control of orchard spraying based on electronic sensing of target characteristics","volume":"30","author":"Giles","year":"1987","journal-title":"Trans. Am. Soc. Agric. Eng."},{"key":"ref_104","unstructured":"Balsari, P., and Tamagnone, M. (1998, January 24\u201327). An Ultrasonic Airblast Sprayer. Proceedings of the in International Conference on Agricultural Engineering, Oslo, Norway."},{"key":"ref_105","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1006\/jaer.2000.0621","article-title":"Pm\u2014Power and machinery: Design and testing of an automatic machine for spraying at a constant distance from the tree canopy","volume":"77","year":"2000","journal-title":"J. Agric. Eng. Res."},{"key":"ref_106","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1006\/jaer.2000.0622","article-title":"PM\u2014Power and machinery: Pesticide loss reduction by automatic adaptation of spraying on globular trees","volume":"78","year":"2001","journal-title":"J. Agric. Eng. Res."},{"key":"ref_107","doi-asserted-by":"crossref","first-page":"473","DOI":"10.1016\/j.biosystemseng.2006.08.004","article-title":"An electronic control system for pesticide application proportional to the canopy width of tree crops","volume":"95","author":"Solanelles","year":"2006","journal-title":"Biosyst. Eng."},{"key":"ref_108","doi-asserted-by":"crossref","first-page":"1287","DOI":"10.1016\/j.cropro.2006.11.003","article-title":"Variable rate application of plant protection products in vineyard using ultrasonic sensors","volume":"26","author":"Gil","year":"2007","journal-title":"Crop. Prot."},{"key":"ref_109","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1016\/j.cropro.2009.12.022","article-title":"Variable rate dosing in precision viticulture: Use of electronic devices to improve application efficiency","volume":"29","author":"Llorens","year":"2010","journal-title":"Crop. Prot."},{"key":"ref_110","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1016\/j.compag.2014.12.015","article-title":"Ultrasonic sensing of pistachio canopy for low-volume precision spraying","volume":"112","author":"Maghsoudi","year":"2015","journal-title":"Comput. Electron. Agric."},{"key":"ref_111","doi-asserted-by":"crossref","first-page":"6270","DOI":"10.3390\/s110606270","article-title":"Robust crop and weed segmentation under uncontrolled outdoor illumination","volume":"11","author":"Jeon","year":"2011","journal-title":"Sensors"},{"key":"ref_112","doi-asserted-by":"crossref","first-page":"1420","DOI":"10.1016\/j.agrformet.2010.07.005","article-title":"Sensitivity of tree volume measurement to trajectory errors from a terrestrial LIDAR scanner","volume":"150","author":"Palleja","year":"2010","journal-title":"Agric. For. Meteorol."},{"key":"ref_113","doi-asserted-by":"crossref","unstructured":"Mahmud, M.S., and He, L. (2020, January 12\u201315). Measuring tree canopy density using a lidar-guided system for precision spraying. Proceedings of the ASABE 2020 Annual Virtual Meeting, Lincoln, NE, USA.","DOI":"10.13031\/aim.202000554"},{"key":"ref_114","unstructured":"Lee, K.H., and Ehsani, R. (2008, January 28\u201329). A Laser-Scanning System for Quantification of Tree-Geometric Characteristics. Proceedings of the American Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008, St. Joseph, MI, USA."},{"key":"ref_115","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1016\/j.biosystemseng.2008.10.009","article-title":"A tractor-mounted scanning lidar for the non-destructive measurement of vegetative volume and surface area of tree-row plantations: A comparison with conventional destructive measurements","volume":"102","author":"Sanz","year":"2009","journal-title":"Biosyst. Eng."},{"key":"ref_116","doi-asserted-by":"crossref","first-page":"2101","DOI":"10.13031\/2013.17795","article-title":"Development of a laser scanner for measuring tree canopy characteristics. phase 1-prototype development","volume":"47","author":"Wei","year":"2004","journal-title":"Trans. ASAE"},{"key":"ref_117","doi-asserted-by":"crossref","first-page":"1505","DOI":"10.1016\/j.agrformet.2009.04.008","article-title":"Obtaining the three-dimensional structure of tree orchards from remote 2D terrestrial LIDAR scanning","volume":"149","author":"Rosell","year":"2009","journal-title":"Agric. For. Meteorol."},{"key":"ref_118","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1016\/j.biosystemseng.2020.05.015","article-title":"Semantic segmentation of sparse 3D point cloud based on geometrical features for trellis-structured apple orchard","volume":"196","author":"Zeng","year":"2020","journal-title":"Biosyst. Eng."},{"key":"ref_119","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1016\/j.rse.2017.01.032","article-title":"Estimation of 3D vegetation density with terrestrial laser scanning data using voxels. A sensitivity analysis of influencing parameters","volume":"191","author":"Grau","year":"2017","journal-title":"Remote Sens. Environ."},{"key":"ref_120","doi-asserted-by":"crossref","unstructured":"Li, S., Dai, L., Wang, H., Wang, Y., He, Z., and Lin, S. (2017). Estimating leaf area density of individual trees using the point cloud segmentation of terrestrial LiDAR data and a Voxel-based model. Remote Sens., 9.","DOI":"10.3390\/rs9111202"},{"key":"ref_121","doi-asserted-by":"crossref","first-page":"3610","DOI":"10.1109\/TGRS.2006.881743","article-title":"Voxel-based 3-D modeling of individual trees for estimating leaf area density using high-resolution portable scanning lidar","volume":"44","author":"Hosoi","year":"2006","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_122","doi-asserted-by":"crossref","first-page":"136666","DOI":"10.1016\/j.scitotenv.2020.136666","article-title":"Determination of spray drift and buffer zones in 3D crops using the ISO standard and new LiDAR methodologies","volume":"714","author":"Torrent","year":"2020","journal-title":"Sci. Total Environ."},{"key":"ref_123","doi-asserted-by":"crossref","first-page":"254","DOI":"10.1016\/j.compag.2015.09.025","article-title":"Orchard mapping and mobile robot localisation using on-board camera and laser scanner data fusion-Part A: Tree detection","volume":"119","author":"Shalal","year":"2015","journal-title":"Comput. Electron. Agric."},{"key":"ref_124","doi-asserted-by":"crossref","first-page":"773","DOI":"10.13031\/2013.41509","article-title":"Development of a variable-rate sprayer with laser scanning sensor to synchronize spray outputs to tree structures","volume":"55","author":"Chen","year":"2012","journal-title":"Trans. ASABE"},{"key":"ref_125","first-page":"1273","article-title":"Spray drift and off-target loss reductions with a precision air-assisted sprayer","volume":"56","author":"Chen","year":"2013","journal-title":"Trans. ASABE"},{"key":"ref_126","doi-asserted-by":"crossref","first-page":"168","DOI":"10.21273\/HORTTECH04497-19","article-title":"Control of insect pests and diseases in an ohio fruit farm with a laser-guided intelligent sprayer","volume":"30","author":"Chen","year":"2020","journal-title":"Horttechnology"},{"key":"ref_127","doi-asserted-by":"crossref","first-page":"1156","DOI":"10.1007\/s11119-020-09712-8","article-title":"Techno-economic impacts of using a laser-guided variable-rate spraying system to retrofit conventional constant-rate sprayers","volume":"21","author":"Manandhar","year":"2020","journal-title":"Precis. Agric."},{"key":"ref_128","doi-asserted-by":"crossref","first-page":"90","DOI":"10.24266\/0738-2898-37.3.90","article-title":"Control of insects and diseases with intelligent variable-rate sprayers in ornamental nurseries","volume":"37","author":"Chen","year":"2019","journal-title":"J. Environ. Hortic."},{"key":"ref_129","first-page":"101","article-title":"Design and experiment of variable rate orchard sprayer based on laser scanning sensor","volume":"11","author":"Li","year":"2018","journal-title":"Int. J. Agric. Biol. Eng."},{"key":"ref_130","doi-asserted-by":"crossref","first-page":"13","DOI":"10.24266\/0738-2898-35.1.13","article-title":"Spray deposition inside multiple-row nursery trees with a laser-guided sprayer","volume":"35","author":"Zhu","year":"2017","journal-title":"J. Environ. Hortic."},{"key":"ref_131","doi-asserted-by":"crossref","first-page":"1827","DOI":"10.13031\/trans.12455","article-title":"Development of a laser-guided, embedded-computer-controlled, air-assisted precision sprayer","volume":"60","author":"Shen","year":"2017","journal-title":"Trans. ASABE"},{"key":"ref_132","unstructured":"Manktelow, D.W. (1998). Factors Affecting Spray Deposits andTtheir Biological Effects on New Zealand Apple Canopies. [Ph.D. Thesis, Massey University]."},{"key":"ref_133","first-page":"96","article-title":"Performance evaluation of newly developed variable rate sprayer for spray deposition in guava orchard","volume":"10","author":"Wandkar","year":"2017","journal-title":"Int. J. Plant. Prot."},{"key":"ref_134","doi-asserted-by":"crossref","first-page":"247","DOI":"10.13031\/2013.2699","article-title":"Optimization of deposition efficiency for airblast sprayers","volume":"43","author":"Salyani","year":"2000","journal-title":"Trans. ASAE"},{"key":"ref_135","doi-asserted-by":"crossref","first-page":"361","DOI":"10.13031\/2013.31338","article-title":"Ground speed effect on spray deposition inside citrus trees","volume":"33","author":"Salyani","year":"1990","journal-title":"Trans. ASAE"},{"key":"ref_136","doi-asserted-by":"crossref","first-page":"275","DOI":"10.1016\/0021-8634(89)90030-9","article-title":"A field investigation to examine the effects of sprayer type, ground speed, and volume rate on spray deposition in Florida citrus","volume":"42","author":"Whitney","year":"1989","journal-title":"J. Agric. Eng. Res."},{"key":"ref_137","doi-asserted-by":"crossref","first-page":"1493","DOI":"10.13031\/2013.23941","article-title":"Coverage and drift produced by air induction and conventional hydraulic nozzles used for orchard applications","volume":"50","author":"Derksen","year":"2007","journal-title":"Trans. ASABE"},{"key":"ref_138","doi-asserted-by":"crossref","first-page":"1472","DOI":"10.3923\/pjbs.2008.1472.1476","article-title":"The effect of the air blast sprayer speed on the chemical distribution in vineyard","volume":"11","author":"Celen","year":"2008","journal-title":"Pak. J. Biol. Sci."},{"key":"ref_139","doi-asserted-by":"crossref","first-page":"5","DOI":"10.13031\/2013.27805","article-title":"Deposition and air speed patterns of air-carrier apple orchard sprayers","volume":"38","author":"Derksen","year":"1995","journal-title":"Trans. ASAE"},{"key":"ref_140","first-page":"919","article-title":"Effect of sprayer boom height on spray drift","volume":"65","author":"Jong","year":"2000","journal-title":"Comm. Agric. Appl. Biol. Sci."},{"key":"ref_141","unstructured":"Steinke, W.E., Wilson, B.W., and Zalom, F.G. (1992, January 28\u201331). Drift Measurements in Dormant Orchard Spraying. Proceedings of the ASAE 1992 Annual International Meeting, St. Joseph, MI, USA. ASAE Paper No. 921083."},{"key":"ref_142","unstructured":"Fox, R.D., Reichard, D.L., Krause, C.R., Brazee, R.D., Svensson, S.A., and Hall, F.R. (1993, January 20\u201323). Effect of sprayer type on downwind deposits from spraying orchards. Proceedings of the 1993 ASAE\/CSAE, St. Joseph, MI, USA. ASAE Paper No. 931078."},{"key":"ref_143","doi-asserted-by":"crossref","first-page":"205","DOI":"10.1006\/jaer.1995.1048","article-title":"The effect of spray application rate and airflow rate on foliar deposition in a hedgerow vineyard","volume":"61","author":"Pergher","year":"1995","journal-title":"J. Agric. Eng. Res."},{"key":"ref_144","unstructured":"Van De Zande, J.C., Michielsen, J.M.G.P., Stallinga, H., Porskamp, H.A.J., Holterman, J.F.M., and Huijsmans, H.J. (2002, January 26\u201327). Spray Distribution When Spraying Potatoes with a Conventional or an Air-Assisted Field Boom Sprayer. Proceedings of the 2002 ASAE Annual Meeting, St. Joseph, MI, USA. Paper No. 021003."},{"key":"ref_145","first-page":"193","article-title":"Air inclusion nozzles don\u2019t reduce pollution of surface water during orchard spraying in the Netherlands","volume":"66","author":"Heijne","year":"2002","journal-title":"Asp. Appl. Biol."},{"key":"ref_146","doi-asserted-by":"crossref","first-page":"275","DOI":"10.1016\/j.biosystemseng.2003.11.012","article-title":"Spray Penetration into Peanut Canopies with Hydraulic Nozzle Tips","volume":"87","author":"Zhu","year":"2004","journal-title":"Biosyst. Eng."},{"key":"ref_147","first-page":"1245","article-title":"Towards more target oriented crop protection","volume":"84","author":"Achten","year":"2008","journal-title":"Int. Adv. Pestic. Appl."},{"key":"ref_148","doi-asserted-by":"crossref","first-page":"1322","DOI":"10.1016\/j.scitotenv.2019.06.121","article-title":"Assessment of spray drift potential reduction for hollow-cone nozzles: Part 1. Classification using indirect methods","volume":"692","author":"Torrent","year":"2019","journal-title":"Sci. Total Environ."},{"key":"ref_149","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1016\/j.compag.2009.11.005","article-title":"A new integrated CFD modelling approach towards air-assisted orchard spraying. Part I. Model development and effect of wind speed and direction on sprayer airflow","volume":"71","author":"Endalew","year":"2010","journal-title":"Comput. Electron. Agric."},{"key":"ref_150","first-page":"177","article-title":"Spray drift and bystander risk from fruit crop spraying","volume":"122","author":"Wenneker","year":"2014","journal-title":"Asp. Appl Biol"},{"key":"ref_151","doi-asserted-by":"crossref","unstructured":"Holterman, H.J. (2003). Kinetics and Evaporation of Water Drops in Air, Institute of Agricultural and Environmental Engendering. IMAG Report 2003-2012.","DOI":"10.18174\/562300"},{"key":"ref_152","doi-asserted-by":"crossref","first-page":"1129","DOI":"10.13031\/2013.23622","article-title":"The influence of operator-controlled variables on spray drift from field crop sprayers","volume":"50","author":"Nuyttens","year":"2007","journal-title":"Trans. ASABE"},{"key":"ref_153","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1615\/AtomizSpr.v8.i3.10","article-title":"Temperature effects on atomization by flat-fan nozzles: Implications for drift management and evidence for surfactant concentration gradients","volume":"8","author":"Downer","year":"1998","journal-title":"At. Sprays"},{"key":"ref_154","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1520\/JAI12900","article-title":"Factors influencing the performance of spray delivery systems: A Review of recent developments","volume":"2","author":"Miller","year":"2005","journal-title":"J. ASTM Int."},{"key":"ref_155","unstructured":"Hanna, M. (2020, December 09). Spray Drift Potential Increases during Warm Weather Applications. Intergrated Crop Management News, Available online: https:\/\/crops.extension.iastate.edu\/cropnews\/2009\/06\/spray-drift-potential-increases-during-warm-weather-applications."},{"key":"ref_156","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1016\/0261-2194(89)90028-8","article-title":"Influence of bifenthrin spray deposit quality on the mortality of Trichoplusia ni (Lepidoptera: Noctuidae) on cabbage","volume":"8","author":"Adams","year":"1989","journal-title":"Crop. Prot."},{"key":"ref_157","doi-asserted-by":"crossref","first-page":"439","DOI":"10.1002\/ps.2780320406","article-title":"The influence of spray droplet characteristics on the efficacy of permethrin against the diamondback moth Plutella xylostella: The effect of drop size and concentration on the potency of ulv- and ec-based residual deposits","volume":"32","author":"Omar","year":"1991","journal-title":"Pestic. Sci."},{"key":"ref_158","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1006\/jaer.1997.0151","article-title":"Effects of polymer composition and viscosity on droplet size of recirculated spray solutions","volume":"67","author":"Zhu","year":"1997","journal-title":"J. Agric. Eng. Res."},{"key":"ref_159","doi-asserted-by":"crossref","first-page":"325","DOI":"10.13031\/2013.20400","article-title":"Foliar deposition and off-target loss with different spray techniques in nursery applications","volume":"49","author":"Zhu","year":"2006","journal-title":"Trans. ASABE"},{"key":"ref_160","doi-asserted-by":"crossref","first-page":"94","DOI":"10.1016\/j.ecolmodel.2013.11.002","article-title":"Towards a model of spray\u2013canopy interactions: Interception, shatter, bounce and retention of droplets on horizontal leaves","volume":"290","author":"Dorr","year":"2014","journal-title":"Ecol. Modell."},{"key":"ref_161","doi-asserted-by":"crossref","first-page":"443","DOI":"10.1614\/0043-1745(2003)051[0443:DSAGRA]2.0.CO;2","article-title":"Droplet size affects glyphosate retention, absorption, and translocation in corn","volume":"51","author":"Feng","year":"2003","journal-title":"Weed Sci."},{"key":"ref_162","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1002\/ps.2780150202","article-title":"Spray impaction, retention and adhesion: An introduction to basic characteristics","volume":"15","author":"Spillman","year":"1984","journal-title":"Pestic. Sci."},{"key":"ref_163","first-page":"204","article-title":"3D-reconstruction and volume measurement of fruit tree canopy based on ultrasonic sensors","volume":"26","author":"Yu","year":"2010","journal-title":"Nongye Gongcheng Xuebao Trans. Chin. Soc. Agric. Eng."},{"key":"ref_164","first-page":"88","article-title":"Spray target detection based on laser scanning sensor and real-time correction of IMU attitude angle","volume":"33","author":"Liu","year":"2017","journal-title":"Nongye Gongcheng Xuebao Trans. Chin. Soc. Agric. Eng."},{"key":"ref_165","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1016\/0261-2194(87)90043-3","article-title":"Influence of droplet size, air-assistance and electrostatic charge upon the distribution of ultra-low-volume sprays on tomatoes","volume":"6","author":"Abdelbagi","year":"1987","journal-title":"Crop. Prot."},{"key":"ref_166","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.cropro.2014.11.006","article-title":"Spray deposition in \u201ctendone\u201d vineyards when using a pneumatic electrostatic sprayer","volume":"68","author":"Pascuzzi","year":"2015","journal-title":"Crop. Prot."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/9\/3262\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:58:16Z","timestamp":1760162296000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/9\/3262"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,5,8]]},"references-count":166,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2021,5]]}},"alternative-id":["s21093262"],"URL":"https:\/\/doi.org\/10.3390\/s21093262","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,5,8]]}}}