Bio Ecology and Management of Stem Fly Melanagromyza Sojae Zehntner Agromyzidae Diptera in Soybean Ecosystem

Abstract

Studies on the survey, biology, varietal screening, crop loss and management of newlinesoybean stem fly, Melanagromyza sojae (Zehnt.) was carried out both at Agricultural newlineResearch Station, Bailhongal and Main Agricultural Research Station, University of newlineAgricultural Sciences, Dharwad during kharif 2006 and 2007. newlineResults of roving survey on the pest status in four districts of major soybean growing newlineareas of Northern Karnataka revealed that highest per cent stem fly incidence of 63.48 and newline61.08 was recorded in Belgaum and Bidar districts, respectively. The lower stem fly incidence newline(12.67%) was recorded in Dharwad. The biology of M. sojae revealed that the mean newlineincubation, larval and pupal period were 5.0, 9.5 and 10.30 days, respectively. The adult newlinelongevity of male and female were 10.50 and 13.00 days, respectively. The total life cycle of newlinestem fly ranged between 23-41 days. newlineAmong the 37 genotypes tested, NRC-55, NRC-51 and DSb-101 were categorized as newlineresistant, MAS-2000-1 and KSHb-2 as susceptible genotypes. The crop loss due to M. sojae newlinerevealed that the seed dressed with thiamethoxam at 3 g/kg seed and foliar application of newlineinsecticide treatments (T1 to T5) recorded lower stem T5 (seed dressed with thiamethoxam newlineimidacloprid chlorphyriphos quinalphos monocrotophos) recorded higher seed yield of newline24.44 and 19.38 q/ha in first and second date of sowings, respectively. The lower seed yield newline(11.63 and 11.47 q/ha) was recorded with untreated check in both the date of sowings, newlinerespectively. newlineAmong the organic, adoptive and inorganic modules tested against M. sojae, the newlineadoptive module (seed treatment with thiamethoxam imidacloprid spray) recommended newlinepackage and organic module. Both soil and topical application of the adoptive module (seed newlinedressed with thiamethoxam spray imidacloprid and RDF + FYM + ZnSO4) recorded newlinesignificantly highest seed yield (26.88 and 26.54 q/ha) at Dharwad and Bailhongal, newlinerespectively. newline