Evaluation of different IPM modules against cotton jassid, Amrasca biguttula biguttula (Ishida) on okra under mid-hill conditions of Himachal Pradesh

Investigations were carried out on evaluation of different IPM modules against cotton jassid, Amrasca biguttula biguttula (Ishida) infesting okra (cv P-8) crop consecutively for three years during the Kharif season of 2008–10 at the seed production farm of Department of Seed Science and Technology, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, HP. All the treatments/modules resulted in lower jassid population/plant as compared to control. The minimum average jassid (nymphs and adults) population (3.99/plant) was recorded in Module I in which treatment of okra seeds with thiamethoxam 70 WS @ 3 g/kg seed followed by foliar sprays of imidacloprid 200 SL @ 0.3 ml/l at 40 days after sowing (DAS), foliar spray of spinosad 45 SC @ 0.3 ml/l at 50 DAS, foliar spray of emamectin benzoate 25 WG @ 0.4g/l at 70 DAS and foliar spray of spinosad 45 SC @ 0.3ml/l at 80 DAS were carried out. This was followed by Module IV with 4.01 nymphs and adults per plant. Module II was found least effective with jassid population of 4.23 nymphs and adults per plant. Significantly minimum jassids (2.39 nymphs and adults/plant) were recorded after 20 days of sowing whereas maximum number of jassids (6.05/plant) was recorded after 40 days of sowing. Maximum seed yield (9.91 q/ha) was also recorded with Module I.