Efficacy of an insect growth regulator on Amaranthus leaf caterpillar, Spoladea recurvalis (Fab.) (Lepidoptera; Crambidae)

Abstract

Insect growth regulator (Novaluron) at different concentrations was evaluated against amaranthus leaf caterpillar for their survival, growth and development on amaranthus leaves in leaf dip bio-assay and contact bio-assay method. Effect of novaluron against Spoladea recurvalisusing contaminated food bio-assay showed that the larvicidal action was observed at 36 hours of treatment and at 60 hours of treatment the maximum mortality (80.00%) was at 3.0 per cent concentration whereasthe lowest pupation, highest pupal mortality and pupal malformation wereat 0.08 per cent concentration. In thecontact bio-assay, all the test concentration data recorded larvicidal effect and pupal malformation.