Effect of antibiotics (250 μg each of gentamicin, penicillin, rifampicin, and streptomycin ml
diet) on mortality of Helicoverpa armigera larvae with LC
concentration of Bt -formulation (A), and the 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.