{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T20:06:21Z","timestamp":1792785981561,"version":"4.5.0"},"reference-count":36,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2022,2,8]],"date-time":"2022-02-08T00:00:00Z","timestamp":1644278400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"funder":[{"name":"USDA-NIFA Specialty Crops Research Initiative","award":["2018-51300-28434"],"award-info":[{"award-number":["2018-51300-28434"]}]},{"name":"USDA-NIFA Organic Research and Extension Initiative","award":["18-0001-053-SC"],"award-info":[{"award-number":["18-0001-053-SC"]}]},{"name":"CDFA Specialty Crops Block Grant Program"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,8,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Spinosyn insecticides are widely used in conventional berry production, and spinosad is regarded as the most effective insecticide for managing Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), spotted-wing drosophila, in organic berry crops. Following the 2017 identification of spinosad resistance in caneberry fields in the Watsonville area, Santa Cruz Co., California, we conducted a study to examine the seasonal and annual susceptibility of D. suzukii over a three-year period. Adult flies were collected from two conventional and two organic caneberry fields in the Monterey Bay region, California, at \u2018early\u2019, \u2018middle\u2019, and \u2018late\u2019 time points during the 2018\u20132020 growing seasons, and their susceptibility to spinosad was assessed. Results demonstrated that spinosad susceptibility in the D. suzukii field populations generally decreased during the fruit production season (from June through November), and over consecutive seasons. LC50 values of adults from the conventional sites were determined to be as high as 228.7 mg l\u22121 in 2018, 665.6 mg l\u22121 in 2019, and 2700.8 mg l\u22121 in 2020. For the organically managed fields, LC50s of adults were as great as 300.0 mg l\u22121 in 2018, 1291.5 mg l\u22121 in 2019, and 2547.1 mg l\u22121 in 2020. Resistance ratios based on the LC50 values were as high as 10.7-, 13.2-, and 16.9-fold in 2018, 2019, and 2020, respectively. These results should serve as a caution for growers in other production areas, facilitate informed choice of insecticides used in D. suzukii management, and emphasize the need to develop effective insecticide resistance management strategies for this insect.<\/jats:p>","DOI":"10.1093\/jee\/toac011","type":"journal-article","created":{"date-parts":[[2022,1,24]],"date-time":"2022-01-24T23:12:10Z","timestamp":1643065930000},"page":"972-980","source":"Crossref","is-referenced-by-count":27,"title":["Spatio-temporal Variation of Spinosad Susceptibility in\n                    <i>Drosophila suzukii<\/i>\n                    (Diptera: Drosophilidae), a Three-year Study in California\u2019s Monterey Bay Region"],"prefix":"10.1093","volume":"115","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1491-8122","authenticated-orcid":false,"given":"Fatemeh","family":"Ganjisaffar","sequence":"first","affiliation":[{"name":"Department of Entomology and Nematology, University of California , Davis, CA 95616 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian E","family":"Gress","sequence":"additional","affiliation":[{"name":"Department of Entomology and Nematology, University of California , Davis, CA 95616 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark R","family":"Demkovich","sequence":"additional","affiliation":[{"name":"Department of Entomology and Nematology, University of California , Davis, CA 95616 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicole L","family":"Nicola","sequence":"additional","affiliation":[{"name":"Department of Entomology and Nematology, University of California , Davis, CA 95616 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7613-8127","authenticated-orcid":false,"given":"Joanna C","family":"Chiu","sequence":"additional","affiliation":[{"name":"Department of Entomology and Nematology, University of California , Davis, CA 95616 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank G","family":"Zalom","sequence":"additional","affiliation":[{"name":"Department of Entomology and Nematology, University of California , Davis, CA 95616 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2022,2,8]]},"reference":[{"key":"2022081023012187200_CIT0001","doi-asserted-by":"crossref","first-page":"2340","DOI":"10.1093\/jee\/toy192","article-title":"Reduced susceptibility of Homalodisca vitripennis (Hemiptera: Cicadellidae) to commonly applied insecticides","volume":"111","author":"Andreason","year":"2018","journal-title":"J. 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