Control efficacy of different seed dressing insecticides against sorghum shoot fly, Atherigona soccata (Rondani) in forage sorghum, Sorghum bicolor (L.) Moench
Ravinder Kumar and US Tiwana
Attack of sorghum shoot fly in sorghum causes considerable yield losses at initial growth stage of plant. Delay in insecticide application for control adds to high yield losses. Seed treatment is the easiest and economical method for timely management of shoot flies. Different seed dressing insecticide treatments viz. thiamethoxam 30 FS, imidacloprid 600FS and fipronil 2.8 EC at varying doses, were imposed on sorghum variety SL 44 during kharif 2015-16. The pooled efficacy data in terms of deadhearts (DH) obtained over two years showed significant reduction in damage across different treatments as compared with untreated control and standard check. Number of eggs laid per five plants within each treatment plots revealed no difference irrespective of treated and untreated seed. Mean data on per cent deadheart count at all the observations revealed the superiority of seed treatment with thiamethoxam 30 FS @ 10 ml per kg seed and closely followed by fipronil @ 10 ml per kg seed and gaucho @ 7ml per kg seed (7.71, 8.79 & 9.47% DH, respectively) in comparison to standard (11.53) and untreated control (17.08). The green fodder yield (q/ha) also revealed the same pattern with 612 q/ha green fodder yield in the seed treatment with thiamethoxam (10ml/kg seed). Economic analysis of different treatments revealed that protection against shoot fly damage lead to yield advantage of 93-153 q/ha and promising treatment yielded net return of Rs. 19370/ha.
Ravinder Kumar, US Tiwana. Control efficacy of different seed dressing insecticides against sorghum shoot fly, Atherigona soccata (Rondani) in forage sorghum, Sorghum bicolor (L.) Moench. J Entomol Zool Stud 2018;6(2):795-799.