![]() In conclusion, the maize cultivars tested are not resistant to FAW. However, using either biorational or synthetic insecticides resulted in between 1.5 and 2.0-fold returns on investment with Agoo having the highest. ![]() The benefit-cost (BC) ratios showed that farmers who do not protect their maize (untreated control) can break even. Yields were at least 1.7-fold higher in all insecticide treatments than in the untreated control in both years. Damage levels (following Davis scale) in the untreated control (5.3) was significantly higher than in the insecticide treatments (3.0–3.6). After treatments application, infestation was highest in the untreated control and lowest in maize treated with K-Optimal. Mean larval infestation before treatments application were not significantly different ( P > 0.05) among the insecticides tested. ![]() Cultivars had no significant effect on the variables measured. Data were collected on FAW larval infestations, damage and yield. The cultivars, Ewul-boyu and Wang-dataa, and the insecticides, neem seed oil (NSO) (azadirachtin), Agoo ( Bacillus thuringiensis, Bt + Monosultap), KD 215 EC (Chlorpyrifos + Lambda-cyhalothrin) and K-Optimal (Lambda-cyhalothrin + Acetamiprid), were arranged in split-plots design. Hence, this study tested the efficacy of selected biorational and synthetic insecticides for the control of FAW in two maize cultivars in Ghana. ![]() Smith), is an economically important insect pest of maize in most African countries, including Ghana. Fall armyworm (FAW), Spodoptera frugiperda (J.E. ![]()
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