Research on Control of Plutella Xylostella L,With the Mixture of Nutrient Biocide“Thuringcide”and Chemical Pesticide

The mixture of nutrient biocide“Thuringcidfe”and four chemical pesticide respectively was used to control Plutella Xylostella L.The result showed that the indoor 72 hour′s proof con-trol of the four mixture ranged from 83.7%to 100%,and their field proof control ranged from 83.2%to 100%after seven days.They were all better than the normal chemical oesticide and Bt sold in the market,also the latter two mixture had the stronger instant control function;the co-toxicity coefficient were between 17.3%and 44.8%,the controlling effect was increasing as the co-toxicity increased.The plutella xylostella L,showed great escape,the eat refusal rate was be-tween 81.3%and 96.5%.Meanwhile the mixture had different nutrient funtion which could in-crease the height and weight of a plant.