Publications by authors named "Lewis R Braswell"
Helicoverpa zea Boddie is a common economic pest of cotton (Gossypium hirsutum L.), including transgenic cotton varieties that express Bacillus thuringiensis (Bt). Helicoverpa zea oviposition is similar in Bt and non-Bt cotton, but behavior of H.
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- Bt cotton varieties show different bollworm larval behavior compared to non-Bt varieties, potentially due to detection of Bt proteins.
- Nitrogen levels and irrigation affect bollworm egg and larval distribution, with higher oviposition observed in nitrogen-treated plots.
- Early instars are evenly distributed, but older instars tend to cluster in mid-canopy areas as the season progresses, suggesting adaptive behavior influenced by plant stress factors.
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.
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