Development and Dispersal of Helicoverpa zea (Lepidoptera: Noctuidae) on Non-Bt and Bt Pyramided Cotton

被引:7
作者
Braswell, Lewis R. [1 ]
Reisig, Dominic D. [2 ]
Sorenson, Clyde E. [1 ]
Collins, Guy D. [3 ]
机构
[1] North Carolina State Univ, Dept Entomol & Plant Pathol, Raleigh, NC 21695 USA
[2] North Carolina State Univ, Dept Entomol & Plant Pathol, Vernon G James Res & Extens Ctr, Plymouth, NC 27962 USA
[3] North Carolina State Univ, Dept Crop & Soil Sci, Upper Coastal Plain Res Stn, 2811 Nobles Mill Pond Rd, Rocky Mount, NC 27801 USA
关键词
behavioral resistance; density dependence; insect behavior; WITHIN-PLANT DISTRIBUTION; SOIL SURFACE-TEMPERATURE; BOLLWORM LEPIDOPTERA; HELIOTHIS-ZEA; BODDIE LEPIDOPTERA; TRANSGENIC COTTON; INSECTICIDAL PROTEINS; OVIPOSITION BEHAVIOR; ARMIGERA LEPIDOPTERA; FEEDING SITES;
D O I
10.1093/ee/nvz006
中图分类号
Q96 [昆虫学];
学科分类号
摘要
Bollworm (Helicoverpa zea Boddie) (Lepidoptera: Noctuidae) can cause economic losses in both non-Bt and Bt cotton. Larvae modify their behavior in the presence of Bt by moving away from terminals faster in Bt cotton compared to non-Bt cotton and avoiding Bt-treated diets. Our objectives were to understand differences in bollworm egg and larvae populations within, and dispersal away from, non-Bt and Bt pyramided-toxin cotton. We conducted small plot experiments in 2016 and 2017 to monitor on-plant egg and larval numbers, and off-plant dispersal of larvae, from non-Bt and different Bt toxin pyramided cotton. Bollworm adults preferred to oviposit in most Bt toxin pyramids compared to non-Bt; this was likely unrelated to detection of Bt by adults, but rather density-dependent aversion from high larval populations. First instar numbers were similar in all non-Bt/Bt toxin pyramids and dispersed at a similar rate. Second through fifth instar numbers were higher in non-Bt than Bt toxin pyramids but dispersed equally from all non-Bt/Bt toxin pyramids, regardless of Bt pyramid type. Development times of larvae were often slower in Bt toxin pyramids compared to non-Bt. Fifth instars were found in, and dispersing from, Bt toxin pyramids containing Vip3A, raising concerns of resistance development. Furthermore, differences in oviposition rate among non-Bt/Bt toxin pyramids and slowed development rate of larvae on Bt varieties could create inconsistencies in generation times emerging from Bt and non-Bt hosts, which could contribute to resistance development.
引用
收藏
页码:465 / 477
页数:13
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