Larval Survival and Development of the Fall Armyworm (Lepidoptera: Noctuidae) on Normal and Transgenic Cotton Expressing the Bacillus thuringiensis CryIA(c) ∂-endotoxin

Document Type

Article

Publication Date

1-1-1998

Abstract

Survival and development of fall armyworms, Spodoptera frugiperda (J. E. Smith), on leaves and bolls of normal (variety DP 5415) and transgenic cotton plants, Gossypium hirsutum L., expressing the Bacillus thuringiensis Berliner (Bt) CryIA(c) ∂-endotoxin (variety NuCOTN 33B) were examined. No significant differences were observed in larval survival between the 2 varieties at 2, 4, 6, 8, 10, and 12 d after exposure. In addition, no significant differences were observed between varieties in the number of larvae that pupated and eclosed as adults. However, larval weights of fall armyworms were significantly higher at 6 and 12 d after exposure on DP 5415 leaves than NuCOTN 33B leaves, and time to pupation and adult eclosion were significantly shorter on DP 5415 leaves than on NuCOTN 33B leaves. No significant differences between varieties were observed for sex ratio, but neonate survival of the subsequent generation was significantly lower from insects reared on NuCOTN 33B. Larval survival to pupation and adult eclosion for larvae fed a combination of DP 5415 foliage (early instars) and bolls (late instars) were significantly higher than for larvae fed NuCOTN 33B foliage and bolls. The effects of a single generation selection of fall armyworms on NuCOTN 33B leaves were also measured. Fall armyworms originally reared on DP 5415 and NuCOTN 33B were fed either normal (DP 5690) or transgenic Bt cotton (NuCOTN 35B) leaves. Larval survival at 2, 4, 6 d after exposure and adult survivorship were not significantly affected by 1 generation of rearing on transgenic Bt cotton. Single generation exposure to NuCOTN 33B did not affect larval weights of the subsequent generation when reared on transgenic Bt cotton.

Publication Source (Journal or Book title)

Journal of Economic Entomology

First Page

539

Last Page

545

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