Population dynamics and bioeficacy of newer insecticide against chilli thrips, Scirtothrips dorsalis (Hood)

The studies on population dynamics and bioefficacy of newer insecticide against chilli thrips, Scirtothrips dorsalis (Hood) was conducted at Vegetable Research Station, MAU, Parbhani during kharif 2002–03. The incidence of thrips was highest during 40^th meteorological week when the prevailing maximum-minimum temperatures, morning-evening relative humidities, rainfall and bright sunshine hours were 35.8°C, 18.0°C, 76%, 34%, 0.00 mm and 11 hrs., respectively. Thrips population exhibited significant negative correlation with evening relative humidity and rainfall and positive correlation with bright sunshine hours. Regression equations worked out indicated that the population decreased by 0.03, 0.04 and increased by 0.303 per unit of evening relative humidity, rainfall and bright sunshine hours, respectively. Application of phosphamidon 40% + imidacloprid 2% SP @ 700 g/ha was most effective for suppression of thrips population and also increased the yield of green chilli.