INDIVIDUAL AND COMBINED EFFICACY OF DIFFERENT INSECTICIDES AGAINST LIPAPHIS ERYSIMI (KALT.) (HOMOPTERA: APHIDIDAE)

The toxicity of carbosulfon 20 ec, acetamiprid 20 sl, triazofos 40 ec, profenofos 50 ec and imidacloprid 20 sl was evaluated, when used alone; and in combination by making carbosulfan as standard and combined with other insecticides in 1:1 ratio; on the mustard aphid, lipaphis erysimi (kalt.) (homoptera: aphididae). the different concentrations ranging from 100,000 ppm, 50,000 ppm down to 390 ppm were prepared and lc_50 values were calculated by probit analysis. the lc_50 value determined after 24 hours for carbosulfon was 9472.2 ppm, acetamiprid 12857 ppm, imidacloprid 32143 ppm, profenofos 35295 ppm and for triazofos was 21338 ppm. the lc_50 values of the combinations were calculated as ; carbosulfon + acetamiprid 18590 ppm, carbosulfon + imidacloprid 15606 ppm, carbosulfon + profenofos 14464 ppm and for carbosulfon + triazofos 20090 ppm. these results suggested that carbosulfon + profenofos combination as the best insecticidal combination for the control of mustard aphid followed by carbosulfon + imidacloprid, carbosulfon + acetamiprid and carbosulfon + triazofos.