Efficacy of newer insecticides and biopesticides against thrips, Scirtothrips dorsalis Hood in chilli

Abstract

Investigations on “Efficacy of newer insecticides and biopesticides against thrips, Scirtothrips dorsalis Hood on chilli.” were conducted at Horticulture farm, S.K.N. College of Agriculture, Jobner during Zaid, 2014 and 2015. Total ten treatments including untreated control were taken for test their efficacy. On the basis of mean per cent reduction in thrips population in all the three sprays the treatment of acetamiprid (82.62%) was found to be the most effective, followed by thiamethoxam (80.79%), imidacloprid (77.90%), fipronil (76.38%) and standard check (71.92%), former three treatments were statistically at par with each other in their efficacy. The treatments of spinosad and NSKE with 61.65 and 48.95 per cent reduction, formed a moderately effective group of insecticides, however, both were differed significantly to each other. The minimum reduction was noticed in M. anisopliae (33.60%) and B. bassiana (34.86%) and both were comparable to each other. The highest fruit yield of 105.11 q ha-1 was recorded in the plots treated with imidacloprid, followed by thiamethoxam (103.18 q ha-1), acetamiprid (99.99 q ha-1), dimethoate/ oxydemeton methyl (99.69 q ha-1) and fipronil (97.65 q ha-1). The highest B: C ratio was recorded in imidacloprid (37.37), followed by acetamiprid (35.18) and dimethoate/ oxydemeton methyl (30.03). The order of effectiveness of these treatments in descending order was acetamiprid > thiamethoxam > imidacloprid > fipronil > standard check > spinosad > NSKE > B. bassiana > M. anisopliae.