Efficacy and economics of newer insecticides for the management of linseed bud fly, Dasyneura lini

Abstract

Field experiments were conducted during Rabi seasons of 2008-09, 2009-10, 2010-11 and 2011-12 to evaluate the efficacy of newer insecticides for the management of linseed bud fly, Dasyneura lini Barnes at the Linseed Research Farm, College of Agriculture, Nagpur, Maharashtra (India). The experimental results revealed that all the treatments showed significant differences in reducing bud fly infestation over control. Lowest bud fly infestation (16.7%) was found in spinosad 45 SC (0.015 %) sprayed linseed plots followed by acetamiprid 20 SP (0.003%) and imidacloprid 17.8 SL (0.004%) with 19.0 and 19.3 per cent bud fly infestation, respectively. Highest mean seed yield of linseed was recorded in spinosad 45 SC (1155 kg/ha) followed by imidacloprid 17.8 SL (1105 kg/ha) and 20 SP (1103 kg/ha). Whereas, the lowest yield was observed in untreated control (689 kg/ha). However, highest incremental cost benefit ratio (ICBR) (1:12.6) was recorded in acetamiprid 20 SP followed by imidacloprid 17.8 SL (1:12.4). Therefore, two fortnightly sprays of acetamiprid 20 SP or imidacloprid 17.8 SL starting from bud initiation are recommended for effective management of linseed bud fly.