The Toxicities of Emamectin Benzoate and Abamectin to Five Agricultural Insects

The toxicities of emamectin benzoate and abamectin to five agricultural pests including cotton bollworm(Heliothis armigera Hubner),Liriomyza satirae Blanchard, two spotted mite(Tetranychus urticae Koch), confused flour beetle(Tribolium confusum Jacquelindu),aphids(Aphis gossypii Glover,Breuicoryae brassicae Linnaeus,Myzus persicae Sulzer), were tested with dipping, diet-incorperation or filter paper residue bioassay.The results showed that emamectin benzoate was more toxic than Abamectin to cotton bollworm with the LC 50 value ratio being 2.0(neonate), 3.6(third instar larvae)),8.4 fold (fourth instar larvae) by diet-incorperation bioassay and 78.5(eggs),25.9(second instar larvae) and 3.7 fold (third instar larvae) by insect dipped bioassay. Emamectin benzoate was also more toxic than abamectin to the aphids,the larvae of Liriomyza satirae Blanchard and the two spotted mite with the LC 50 value ratio being 1.9(cabbage aphid), 2.4(cotton aphid), 2.7 fold (green peach aphid), 5.7(Liriomyza satirae Blanchard), and 3.6(two spotted mite) fold respectively. But abamectin was more toxic than emamectin benzoate to the adult of Liriomyza satirae Blanchard with the LC 50 value ratio being 37.1 fold.The toxicity of Emamectin benzoate and abamectin to confused flour beetle was lower than that of phoxim by filter paper residue bioassay.