The genus Tetrigoidea is a member of the order Homoptera, which is a nymph of the late instar. The nymphs begin to emerge as adults in March of the following year. The worms are pale brown and white-winged. Adults live for about 5 to 7 days and spawn mainly on the leaves. The larvae's initial incubation period is light yellow and darkens as the worm ages. The larvae suck the leaf fluid and injure the tree body. The larval period is about 15 to 20 days. The main basis for identification of the worm is the characteristics of the oyster shell, the pod is white, nearly oval, no vertical ridge on the back, the valve hole and the edge are almost at the same level, there is no bristles around the oyster shell, the oyster shell thin as a film. Larvae secretions cause soot, making the fruit black, affecting the appearance. According to preliminary observations, there are three distinct peak periods in the year. The first generation larvae occur in the middle and late April, the second generation larvae occur in the middle and late June, and the third generation larvae occur in the eighth period. Around mid-month. At present, the use of chemical control, focusing on the prevention and treatment of the first generation of young nymphs, in the nymph period of drug use, the general year in late April began drug use, the drug selection of 2000 times the meritorious + Puxiong 1000 times, a net 2000 times + speed grams毙1000 times, the effect is good. In the second generation of larvae occur once again during the peak period.
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