In the 3rd instar, the body wall is very thin, and there are many micro hairs on the body wall. The epidermis of the micro hairy part is very thin, and the medicine is easy to pass through this layer, and at this time, the insect body is small and the food intake is relatively small. Large, light damage, small field of activity, weak resistance to drugs (drug resistance), so to determine the appropriate period of control of pests, should be controlled before the peak of 2 to 3 years of age, and some should be controlled before and after the peak of egg hatching, Can achieve the best control effect.
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