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Browsing by Author "Catchot, Angus L."

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    First transgenic trait for control of plant bugs and thrips in cotton
    Akbar, Waseem; Gowda, Anilkumar; Ahrens, Jeffrey E.; Stelzer, Jason W.; Brown, Robert S.; Bollman, Scott L.; Greenplate, John T.; Gore, Jeffrey; Catchot, Angus L.; Lorenz, Gus; Stewart, Scott D.; Kerns, David L.; Greene, Jeremy K.; Toews, Michael D.; Herbert, D. Ames Jr.; Reisig, Dominic D.; Sword, Gregory A.; Ellsworth, Peter C.; Godfrey, Larry D.; Clark, Thomas L. (Wiley, 2018-12-18)
    BACKGROUND: Plant bugs (Lygus spp.) and thrips (Thrips spp.) are two of the most economically important insect pest groups impacting cotton production in the USA today, but are not controlled by current transgenic cotton varieties. Thus, seed or foliar-applied chemical insecticides are typically required to protect cotton from these pest groups. Currently, these pests are resistant to several insecticides, resulting in fewer options for economically viable management. Previous publications documented the efficacy of transgenic cotton event MON 88702 against plant bugs and thrips in limited laboratory and field studies. Here, we report results from multi-location and multi-year field studies demonstrating efficacy provided by MON 88702 against various levels of these pests. RESULTS: MON 88702 provided a significant reduction in numbers of Lygus nymphs and subsequent yield advantage. MON 88702 also had fewer thrips and minimal injury. The level of control demonstrated by this transgenic trait was significantly better compared with its non-transgenic near-isoline, DP393, receiving insecticides at current commercial rates. CONCLUSION: The level of efficacy demonstrated here suggests that MON 88702, when incorporated into existing IPM programs, could become a valuable additional tool for management of Lygus and thrips in cotton agroecosystems experiencing challenges of resistance to existing chemical control strategies. © 2018 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. © 2018 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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    Standardized Field Trials in Cotton and Bioassays to Evaluate Resistance of Tobacco Thrips (Thysanoptera: Thripidae) to Insecticides in the Southern United States
    Krob, Jessica L.; Stewart, Scott D.; Brown, Sebe A.; Kerns, Dawson; Graham, Scott H.; Perkins, Clay; Huseth, Anders S.; Kennedy, George G.; Reisig, Dominic D.; Taylor, Sally V.; Towles, Tyler B.; Kerns, David L.; Thrash, Benjamin C.; Lorenz, Gus M.; Bateman, Nick R.; Cook, Don R.; Crow, Whitney D.; Gore, Jeffrey; Catchot, Angus L.; Musser, Fred R.; Catchot, Beverly (Oxford University Press, 2022-09)
    Foliar-applied insecticide treatments may be necessary to manage thrips in cotton (Gossypium hirsutum L.) under severe infestations or when at-planting insecticide seed treatments do not provide satisfactory protection. The most common foliar-applied insecticide is acephate. Field observations in Tennessee suggest that the performance of acephate has declined. Thus, the first objective was to perform leaf-dip bioassays to assess if tobacco thrips, Frankliniella fusca (Hinds) (Thysanoptera: Thripidae), in cotton production regions have evolved resistance to foliar-applied insecticides. A second objective was to assess the performance of commonly applied foliar insecticides for managing thrips in standardized field trials in Arkansas, Tennessee, Mississippi, and Texas. For both objectives, several insecticides were evaluated including acephate, dicrotophos, dimethoate, lambda-cyhalothrin, imidacloprid, and spinetoram. Field trials and bioassays were completed from 2018 to 2021. Dose-response bioassays with acephate were performed on tobacco thrips field populations and a susceptible laboratory population. Bioassay results suggest that tobacco thrips have developed resistance to acephate and other organophosphate insecticides; however, this resistance seems to be most severe in Arkansas, Tennessee, and the Delta region of Mississippi. Resistance to other classes of insecticides were perhaps even more evident in these bioassays. The performance of these insecticides in field trials was variable, with tobacco thrips only showing consistent signs of resistance to lambda-cyhalothrin. However, it is evident that many populations of tobacco thrips are resistant to multiple classes of insecticides. Further research is needed to determine heritability and resistance mechanism(s).