Papulation Dynamics of Sucking Pests their Natural Enemies and Bollworm Complex in Bt Cotton

Population dynamics of sucking pests, natural enemies and bollworm complex in Bt cotton was carried out at Department of Agril. Entomology, V.N.M.K.V., Parbhani during Kharif 2014–15. The population dynamics of sucking pests revealed that the sucking pest population was mostly severe from fourth week of August to second week of December i.e. 34^th to 50^th Meteorological Week(MW). In aphids, the first peak with maximum population (37.53 aphids/3 leaves) occur in 43^rd MW. Whereas, the first peak with maximum of jassids (35.40 jassids/3 leaves), thrips (41.70 thrips/3 leaves) and whitefly (15.70 whiteflies/3 leaves) were occurred during 34^th, 39^th and 40^thMW, respectively. Natural enemies population was maximum from fourth week of august to second week of December i.e., 34^th to 50^th. Whereas, the first peak of Ladybird beetle (2.60 beetles/plant) and spider (1.50 spider/plant) were occurred during 43^rd and 40^th MW respectively. Incidence of H. armigera started from 38^th MW. The peak incidence of H. armigera was recorded in 39^th MW to 50^th MW. Maximum population of larvae recorded (2.30 larvae/5 plants) during 47^th MW (19–25 November). The incidence of pink bollworm, Pectinophora gossipiella and Earias spp population were negligible with lowest population of pink bollworm (0.10 larvae/5 plant) during 48^th MW (26 Nov-2 Dec) and population of Earias spp recorded 0.20 larvae/5 plant during 44^th MW (29 Oct-4 Nov).