POPULATION DYNAMICS AND MANAGEMENT OF SOYBEAN [Glycine max (L.) Merril] DEFOLIATOR Spodoptera litura (Fab.) (Noctuidae: Lepidoptera)
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Date
2022-12-13
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University of Agricultural Sciences, Bangalore
Abstract
Studies on population dynamics and management of soybean defoliator, Spodoptera litura (Fab.) was conducted at the AICRP on Soybean, ZARS, University of Agricultural Sciences, Bengaluru during the Kharif– 2021. The delayed sown crop recorded higher population density of soybean insect pests viz., Melanagromyza sojae (Zehntner), S.litura, Thysanoplusia orichalcea (Fab.) and Omiodes indicata (Fab.). The early sown crop during 24th Standard Meteorological Week recorded least per cent pod damage by H. armigera. Least grain yield of 625 kg/ha was obtained by the delayed sown soybean genotype JS-335 (30th Standard Meteorological Week). Soybean genotype MAUS-818 recorded least per cent seedling infestation by M. sojae. Whereas, the genotype MAUS-2 recorded least S. litura
larval population of 2.67 larvae/mrl. The genotype KDS-1149 recorded the least number of T. orichalcea larva (1.00 larva/mrl). Minimum larval population of leaf folder, O. indicata (2.60 larvae/mrl) was recorded in the genotype MACS-1672. Higher grain yield of 1800 kg/ha was obtained from MAUS-2. Among insecticides, chlorantraniliprole 18.5 SC @ 0.30 ml/l was most effective in suppressing the larval population of S. litura and recorded the least larval population of 0.49 larvae/mrl. Maximum grain yield of (1456 kg/ha) was recorded in the plots treated with chlorantraniliprole 18.5 SC @ 0.30 ml/l with a C : B ratio of 1 : 2.33.