Survey on the seasonal incidence of insect pests of soybean in Bemetara district of Chhattisgarh state

Abstract

Survey work for visualization of real pest problem of four blocks i.e. Bemetara, Berla, Saja and Nawagarh of Bemetara district (C.G.) was conducted during Kharif, 2017-18 and 2018-19. Ten villages in each block were visited during crop growth period. Girdle beetle, S. litura, C. acuta, B. tabaci and E. kerri were observed as major insect pests in soybean ecosystem under the blocks of Bemetara district. The maximum block seasonal mean activity of girdle beetle was recorded in Berla block with 5.3 damaged plants/mrl in which the Damai village of Berla block having maximum intensity of girdle beetle with 9.5 damaged plants/mrl. Bemetara block was earmarked for maximum block seasonal mean population of leaf defoliators i.e. S. litura and C. acuta with 3.2 larvae/mrl and 3.7 larvae/mrl, respectively. However, Mohbatta village of Bemetara block received maximum population of S. litura (7.6 larvae/mrl) and C.acuta (6.2 larvae/mrl). In Nawagarh block, highest block seasonal mean intensity of B. tabaci was recorded with 19.0 whiteflies/five plants. Another sucking pest E. kerri showed maximum block seasonal mean population in Bemetara block (6.9 jassids/five plants). Among the different blocks, Bemetara and Berla blocks were found favourable for maximum activities of predatory insects.