Sublethal Effects of Two Insecticides on Population Dynamics and Enzymatic Detoxification in Spodoptera frugiperda (J.E. Smith)

Many species of devastating insect pests have acquired a high degree of resistance to insecticides. Fall armyworm (FAW) is a notorious polyphagous pest that seriously damages several crops and reduces their economic value. Sublethal effects of hexaflumeron and emamectin benzoate on FAW parental (F0), offspring (F1) generations, and enzymatic properties were assessed. The development time of the larval, pupal and adult stages was significantly affected in FAW (F0) treated with sublethal concentration (LC20) of hexaflumeron and emamectin benzoate compared with control. Female adult longevity was significantly longer following LC20 treatment than in the control and male adult longevity treatment groups. However, significantly reduced the oviposition period and fecundity. In the FAW offspring generation (F1), significantly decreased the intrinsic rate of growth (r), net reproductive rate (R0), and finite rate of growth (λ). The activity of detoxifying enzymes, such as cytochrome P450 (P450), general esterases (ESTs), and glutathione S-transferase (GST) were induced by hexaflumeron and emamectin benzoate.

Sublethal Effects of Two Insecticides on Population Dynamics and Enzymatic Detoxification in Spodoptera frugiperda (J.E. Smith) Keywords:

Development , fecundity , Emamectin benzoate , Hexaflumeron , Sublethal effects , detoxification enzymes