Field Effects of Four Insecticides on Controlling Plutella xylostella L

Four chemical insecticides were tested in field for controlling Plutella xyloste1la L.The results showed that after the insecticides applied 1,3,7 days,the control effects were 53.01%～60.03%,73.01%～80.05%、78.71%～90.96% respetively.5% Emamectin benzoate EC has excellent activity against P.xylostella L and could be widely used in production.