Bioefficacy of newer insecticides against aphid, Aphis craccivora Koch on cowpea

Investigations were conducted on the “Bioefficacy of newer insecticides against aphid, Aphis craccivora Koch on cowpea”. at Agronomy farm, of S.K.N. College of agriculture, Jobner Rajasthan) during kharif, 2016. The insecticides viz., imidacloprid, thiamethoxam and dimethoate were found effective against the pests whereas, the azadiracthin and malathion were found least effective against the pest. The highest grain yield of 20.38 qha-1 was recorded in the plots treated with imidacloprid, followed by thiamethoxam (19.32 q ha-1). The minimum grain yield of 11.98 q ha-1 was obtained in the plots treated with azadirachtin (0.002) followed by the treatment malathion 0.05 percent (12.02 q ha-1) which was found statistically at par with each other. The highest B: C ratio (19.01:1) was recorded in the treatment of thiamethoxam followed by imidacloprid 0.005 percent and dimethoate 0.03 percent, which resulted in a benefit: cost ratio of 16.52 : 1 and 8.74: 1, respectively whereas, lowest benefit : cost ratio of 1.21: 1 was recorded from plots treated with chlorantraniliprole 0.005 percent.