Behavior, Growth, Survival, and Plant Injury by Heliothis virescens (F.) (Lepidoptera: Noctuidae) on Transgenic Bt Cottons

Effect of Pyramiding Bt and CpTI Genes on Resistance of Cotton to Helicoverpa armigera (Lepidoptera: Noctuidae) Under Laboratory and Field Conditions

“…This contrast accentuates that many factors affect the level of resistance exhibited by transgenic cotton varieties, and need to be taken into account when assessing resistance. Similar to results of Zhang et al (2004), we found a major difference in acceptance between conventional cotton on the one hand and the two transgenic varieties, in agreement with results in Bt cotton in other studies (e.g., Benedict et al 1992, Li et al 2007, Yang et al 2008.…”

Intraguild interactions and behavior of Spodoptera frugiperda and Helicoverpa spp. on maize

“…70 In Bt cotton, larvae of Heliothis virescens (F.) (Lepidoptera: Noctuidae) abandoned Bt plants with higher frequency than those developing on non-Bt plants. 71,72 Overall, interactions among the ear-feeding Lepidoptera, in the case of this study with noctuids, affect their behavior, and larvae of S. frugiperda gain competitive advantage in intraguild interaction with H. zea and H. armigera on non-Bt maize. A better understanding of the intraguild interactions is essential to determine the impact they will have on species abundance in agricultural systems.…”

“…For Ostrinia nubilalis (Hübner) (Lepidoptera: Pyralidae), larval movement was higher on Bt plants than on non‐ Bt plants, and observations with a video tracking system demonstrated that larvae increased the distance moved, the time spent moving and the time away from the diet in the presence of Cry1Ab tissue . In Bt cotton, larvae of Heliothis virescens (F.) (Lepidoptera: Noctuidae) abandoned Bt plants with higher frequency than those developing on non‐ Bt plants …”

Field Evaluation of Soybean Engineered with a Synthetic <I>cry1Ac</I> Transgene for Resistance to Corn Earworm, Soybean Looper, Velvetbean Caterpillar (Lepidoptera: Noctuidae), and Lesser Cornstalk Borer (Lepidoptera: Pyralidae)

“…Jack also was signiÞcantly more resistant than Jack-HPH at both 8 d (F ϭ 19.59; df ϭ 4, 11; P Ͻ 0.001) and 22 d after infestation (F ϭ 40.43; df ϭ 4, 11; P Ͻ 0.001), which is difÞcult to explain unless somaclonal variation or transgene positional effects are involved. These phenomena are not uncommon in transgenic plants regenerated from tissue culture (Benedict et al 1992(Benedict et al , 1993.…”