Toxicity of Several Inseccides to Different Stages of Aleurodicus dispersus Russell
The toxicity of 30 kinds of insecticides on the adult and 15 kinds of insecticides on the 3rd instar nymph of Aleurodicus dispersus were determined by Potter spraying method.The results showed that methidathion,chlorpyrifos,phoxim,malathion,alpha-cypermethrin,deltamethrin,dichlorvos and profenofos had higher toxicity on the adult and 3rd instar nymphs.Methidathion,chlorpyrifos,phoxim,malathion,alpha-cypermethrin,deltamethrin,dichlorvos and profenofos got higher toxicity on the adult with LC50 of 0.912 3,1.571 4,1.673 1,2.248 2,2.557 0,3.039 1,3.186 8 and 4.189 5 mg/L,respectively.Deltamethrin,methidathion,chlorpyrifos,lambda-cyhalothrin and beta-cypermethrin got higher toxicity on the instar nymph with LC50 of 8.527 6,11.486 5,12.950 3,12.973 8 and 13.7036 mg/L,respectively.The sensitivity of different instar nymph to 8 kinds of insecticides was measured with Potter spraying method.The results indicated that the 1st instar nymph had higher than 2-4 instar nymph,and the 4 instar nymph had the less sensiticity.