{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,7]],"date-time":"2026-04-07T12:15:37Z","timestamp":1775564137665,"version":"3.50.1"},"reference-count":66,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2021,7,19]],"date-time":"2021-07-19T00:00:00Z","timestamp":1626652800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"VIRGINIA PEANUT BOARD","award":["N\/A"],"award-info":[{"award-number":["N\/A"]}]},{"name":"VIRGINIA AGRICULTURAL COUNCIL","award":["N\/A"],"award-info":[{"award-number":["N\/A"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Hyperspectral sensors combined with machine learning are increasingly utilized in agricultural crop systems for diverse applications, including plant disease detection. This study was designed to identify the most important wavelengths to discriminate between healthy and diseased peanut (Arachis hypogaea L.) plants infected with Athelia rolfsii, the causal agent of peanut stem rot, using in-situ spectroscopy and machine learning. In greenhouse experiments, daily measurements were conducted to inspect disease symptoms visually and to collect spectral reflectance of peanut leaves on lateral stems of plants mock-inoculated and inoculated with A. rolfsii. Spectrum files were categorized into five classes based on foliar wilting symptoms. Five feature selection methods were compared to select the top 10 ranked wavelengths with and without a custom minimum distance of 20 nm. Recursive feature elimination methods outperformed the chi-square and SelectFromModel methods. Adding the minimum distance of 20 nm into the top selected wavelengths improved classification performance. Wavelengths of 501\u2013505, 690\u2013694, 763 and 884 nm were repeatedly selected by two or more feature selection methods. These selected wavelengths can be applied in designing optical sensors for automated stem rot detection in peanut fields. The machine-learning-based methodology can be adapted to identify spectral signatures of disease in other plant-pathogen systems.<\/jats:p>","DOI":"10.3390\/rs13142833","type":"journal-article","created":{"date-parts":[[2021,7,19]],"date-time":"2021-07-19T21:39:15Z","timestamp":1626730755000},"page":"2833","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Identifying Optimal Wavelengths as Disease Signatures Using Hyperspectral Sensor and Machine Learning"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8668-0163","authenticated-orcid":false,"given":"Xing","family":"Wei","sequence":"first","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA"},{"name":"Virginia Tech Tidewater Agricultural Research and Extension Center, Suffolk, VA 23437, USA"}]},{"given":"Marcela A.","family":"Johnson","sequence":"additional","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA"},{"name":"Genetics, Bioinformatics, and Computational Biology Program, Virginia Tech, Blacksburg, VA 24061, USA"}]},{"suffix":"Jr.","given":"David B.","family":"Langston","sequence":"additional","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA"},{"name":"Virginia Tech Tidewater Agricultural Research and Extension Center, Suffolk, VA 23437, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8570-3562","authenticated-orcid":false,"given":"Hillary L.","family":"Mehl","sequence":"additional","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA"},{"name":"Virginia Tech Tidewater Agricultural Research and Extension Center, Suffolk, VA 23437, USA"},{"name":"United States Department of Agriculture, Agricultural Research Service, Arid-Land Agricultural Research Center, Tucson, AZ 85701, USA"}]},{"given":"Song","family":"Li","sequence":"additional","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"205","DOI":"10.1016\/S0378-4290(97)00032-4","article-title":"Peanut (Arachis hypogaea L.)","volume":"53","author":"Stalker","year":"1997","journal-title":"Field Crops Res."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"4705","DOI":"10.1021\/jf0606959","article-title":"Chemical composition of selected edible nut seeds","volume":"54","author":"Venkatachalam","year":"2006","journal-title":"J. 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