Toxicity and field control efficiency of imidacloprid,matrine and their combination against Aphis gossypii on Vicia villosa
In order to control the aphids damage on a green manure crop of hairy vetch Vicia villosa Roth,and screen out highly efficient insecticide formula,imidacloprid and matrine with different action mechanisms were selected to screen the optimal ratio and evaluate the field control effect.The results showed that the four combinations of imidacloprid and matrine(the ratio of active ingredient content was 1∶10,1:20,1∶40 and 1:80,respectively)had obvious synergistic effect on the cotton aphids from V.villosa.Co-toxicity coefficients(CTC)1∶20 combination was the highest(376.14).It also showed that the mixture combination(1:20)had a better control effect on V.villosa aphid at the dose of 5.94 g/hm2.Control efficacies of three and seven days after insecticide application was significantly higher than those of two single control agents,and the maximum efficacy was nearly 80％.Therefore,it can be used as a recommended agent to control the aphids on the green manure crop of V.villosa.
Vicia villosaAphis gossypiiimidaclopridmatrineco-toxicityfield control efficiency
万方数据
维普
