author(s)
Suresh Jakhar, Ashok Sharma and Pawan Kumar Choudhary

abstract
A field experiment was conducted at Horticulture farm, S.K.N. College of Agriculture, Jobner (Rajasthan) during kharif season 2013. The experiment consisted 6 insecticides Thiamethoxam (0.025%), Imidacloprid (0.005%), Malathion (0.05%), Fipronil (0.01%), Acetamiprid (0.004%), Dimethoate (0.03%) against aphid, jassid and whitefly population. The result revealed that out of six insecticides found relative efficacy of imidacloprid (0.005%) was most effective. The treatment of malathion (0.05%) proved least effective. The fruit yield showed that imidacloprid treated plants yielded maximum and it was followed by malathion. The benefit cost ratio was highest in imidacloprid and lowest in thiamethoxam the treatment of imidacloprid reduced First spray the aphid population by 76.02 per cent followed by dimethoate (73.35%). Second spray, the treatment of imidacloprid (77.64%) gave highest reduction in aphid population followed by dimethoate (71.53%) but was comparable to each other. The efficacy of pesticides in ascending order was: malathion, fipronil, thiamethoxam, acetamiprid, dimethoate and Imidacloprid. Against jassid, first spray the treatments of imidacloprid reduced the population by 72.72 per cent and proved most effective, however, remained superior to rest of the treatment. It was followed by dimethoate (70.03%) and second spray the treatment of imidacloprid (74.30%) resulted in highest reduction in jassid population followed by dimethoate (68.37%) and did not differ to each other, The ascending order of efficacy was: fipronil, malathion, thiamethoxam, acetamiprid, dimethoate and imidacloprid. Against whitefly, first spray the treatment of imidacloprid proved most effective with 71.79 per cent reduction followed by dimethoate (66.94%), second spray The treatments of imidacloprid (73.35%) gave highest reduction and proved most effective followed by dimethoate (65.28%) but remained statistically at par with each other. The efficacy of pesticides in ascending order was: malathion, fipronil, thiamethoxam, acetamiprid, dimethoate and imidacloprid.