Efficacy of novel insecticide against Helicoverpa armigera and residue study of chloranatraniliprole in tomato

An attempt was made to evaluate the efficacy of some novel insecticides for the management of Helicoverpa armigera infesting tomato and furthermore dissipation behaviour and residue study of insecticide was carried out which was found to be superior in term of the efficacy against H. armigera. Among different insecticides tested, chlorantraniliprole 18.5 SC recorded lowest number of mean population of larvae (0.28/ five plants) so found most effective and followed by indoxacarb 14.5SC and flubendiamide 20 WG while quinalphos 25% EC was found to be least effective with highest mean larval population (0.68/ five plants). To check the environmental and consumer health safety of chlornatraniliprole dissipation behaviour and half- life was also studied. The residue results showed that initial deposits in/on tomato fruits at recommended single (30 g a.i./ ha) and double of purposed dose (60 g a.i./ ha) doses was recorded 1.17 and 2.36 mg kg^− 1 respectively. Further residues reached below Limit of Quantification (LOQ) on 10th day in case of recommended single dose and 20th day in case of double purposed dose in chlorantraniliprole after application. The calculated half -life of chlorantraniliprole in fruit was 1.57 and 1.98 days at single (T₁) and double dose (T₂), respectively. Amount of residue detected in soil collected at time of harvest in both doses were below limit of Quantification (LOQ) which suggested that use of chlorntraniliprole for management of H. armigera is quite safe and can be used in IPM programme.