Figure 4
Effect of antibiotics (250 μ g each of gentamicin, penicillin, rifampicin, and streptomycin ml −1 diet) on weights of Helicoverpa armigera larvae with LC 50 concentration of Bt -formulation (A), and toxin proteins Cry1Ab (B) and cry1Ac (C). LC50 = Effective dose to cause 50% larval mortality. F1, F2, and F3 = Helicoverpa armigera generations exposed to antibiotics.