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Calvin mail4/7/2024 ![]() The frequency of yield increase from spraying WS was comparable to that of NBT. All Bt technologies tested in the current study exhibited a positive increase in yield from insecticide application. The 6% fruiting form injury threshold resulted in a 25 and 75% reduction in insecticide applications relative to preventive sprays for WS and BG2, respectively. Additionally, the differences in yield from spraying bollworms was compared among Bt cotton technologies. ![]() A 6% fruiting form injury threshold was selected and compared with preventive treatments utilizing chlorantraniliprole. Gain threshold, economic injury level, and economic thresholds were determined. Bt cotton technologies including TwinLink (TL Cry1Ab+Cry2Ae), TwinLink Plus (TLP Cry1Ab+Cry2Ae+Vip3Aa), Bollgard II (BG2 Cry1Ac+Cry2Ab), Bollgard 3 (BG3 Cry1Ac+Cry2Ab+Vip3Aa), WideStrike (WS Cry1Ac+Cry1F), WideStrike 3 (WS3 Cry1Ac+Cry1F+Vip3Aa), and a non-Bt (NBT) variety were evaluated. Field experiments were conducted across the Mid-South and in Texas to devise economic thresholds for foliar insecticide applications targeting bollworm in cotton. Consequently, foliar insecticide applications have been widely adopted to provide necessary additional control. ![]() Widespread field-evolved resistance of bollworm to Cry1 and Cry2 Bt proteins has threatened the utility of Bt cotton for managing bollworm.
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