Effect of cyantraniliprole on feeding behavior and virus transmission of Frankliniella fusca and Frankliniella occidentalis (Thysanoptera: Thripidae) on Capsicum annuum |
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| Institution: | 1. Louisiana State University AgCenter, Department of Entomology, Baton Rouge, LA 70803, United States;2. United States Department of Agriculture-Agricultural Research Service, Knipling-Bushland United States Livestock Insects Research Laboratory, Veterinary Pest Genomics Center, 2700 Fredericksburg Rd., Kerrville, TX 78028, United States;1. Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea;2. Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea;3. Department of Horticultural Crop Research, National Institute of Horticultural and Herbal Science, RDA, Seoul 151-921, Republic of Korea;4. Division of Crop Protection, National Academy of Agricultural Science, Rural Development Administration, Suweon 440-707, Republic of Korea;5. Highland Agriculture Research Center, NICS, RDA, Pyeong-chang 232-955, Republic of Korea |
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| Abstract: | The anthranilic diamide insecticide cyantraniliprole was previously shown to reduce transmission of Tomato spotted wilt virus (TSWV) to pepper, Capsicum annuum, by Frankliniella fusca but not Frankliniella occidentalis. This study examines the effects of cyantraniliprole and imidacloprid on thrips feeding using electrical penetration graphing (EPG), and on TSWV transmission in field cage studies. Some antifeedant responses were observed in the EPG studies when thrips fed on cyantraniliprole- and imidacloprid-treated plants; however, these responses were variable between species and among the 2, 6, and 10 day post-treatment time intervals during which feeding behavior was observed. Cyantraniliprole significantly reduced the probability of TSWV infection when spread by F. fusca in field-grown pepper when viruliferous thrips were released 7 days but not when released at 14 days after the insecticide treatment in one of 2 field trials. In the second trial cyantraniliprole significantly reduced the probability of infection when F. fusca were released 14 days but not 7 days after treatment. In both years, imidacloprid prevented or significantly reduced transmission of TSWV by F. fusca in field-grown pepper when viruliferous thrips were released 7 days and 14 after treatment. In one of two years, cyantraniliprole significantly reduced the incidence of TSWV in field-grown pepper that was spread by F. occidentalis when viruliferous thrips were released 7 days after the insecticide treatment, but not 14 days after the treatment. Imidacloprid did not reduce the incidence of TSWV in field-grown pepper when viruliferous F. occidentalis were released. Although these studies demonstrate that probing behavior of these thrips species is altered on cyantraniliprole-treated pepper plants, results of field cage studies did not consistently show a reduction in incidence of TSWV-infected plants. |
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| Keywords: | Tomato spotted wilt virus Imidacloprid Cyazypyr Anthranilic diamide Electrical penetration graph |
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