Seasonal incidence of leaf roller, Psorosticha zizyphi (Stainton) (Lepidoptera: Oecophoridae) on curry leaf, Murraya koenigii (L.) Sprengel and its management

Abstract

The seasonal incidence of leaf roller, Psorosticha zizyphi Stainton on curry leaf, Murraya koenigii (L.) Sprengel was studied at University of Agricultural Sciences, Dharwad, India. The maximum activity of the leaf roller was recorded from 31st SMW to 36th SMW and the population ranged from 15.40 to 23.60 larvae/plant. The peak population of 23.60 larvae/plant was recorded at 36th SMW (1st week of September). There existed a positive and highly significant correlation between larval population and minimum temperature, morning and evening relative humidity. Efficacy of different biorationals was tested against the leaf roller larvae under field conditions. The treatment with spinosad 45 SC proved to be effective by recording the lowest larval population of 2.96 and 3.97/plant in both the sprays at 5 days after spray. The next best treatment in recording lower insect population was novaluron 10 EC.