Efficacy of Jasmonic Acid Application on Aphid (Aphis gossypii Glover) Population in Chilli (Capsicum annuum L.)

Studies conducted during 2022–23 at the Insectary, AICRP on Biocontrol, AAU, Jorhat evaluated Jasmonic acid (JA)–induced resistance in chilli against aphids. Two experimental sets were maintained: Set A with a single JA spray at 20 DAT and Set B with two sprays at 20 and 60 DAT, comprising JA at 0.1, 0.5, 1.0 and 1.5 mM along with an untreated control. Results indicated that JA application significantly reduced aphid infestation, with the lowest aphid population consistently observed at 1.0 mM concentration. Two JA applications were more effective than a single spray in suppressing aphid population and enhancing plant recovery from aphid stress. Overall, JA @ 1.0 mM proved most effective in inducing resistance, highlighting jasmonic acid as a promising and sustainable elicitor for aphid management in chilli.