Susceptibility of malathion-resistant and susceptible Tribolium castaneum adults to abamectin, spinosad and indoxacarb

Laboratory studies were carried out to determine the susceptibility of 10-day-old adultsof malathion-resistant (PAK) and organophosphates-susceptible (FSS-II) strains of Tribolium castaneum to abamectin, spinosad and indoxacarb after 48 hours of treatment through residual film method. Adults of both strains were susceptible to abamectin and spinosad. The PAK strain was comparatively less susceptible to indoxacarb. Abamectin produced the lowest LC50 values for PAK (88 mg L ^- 1 ) and FSS-II (109 mg L-^ 1 ), strains. These findings support the hypothesis that adult PAK and FSS-II, strains of T. castaneum were susceptible to abamectin, spinosad and indoxacarb.