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.