Daqingye is one of the major pests that harm young trees. The prevention and treatment experience and technical measures are now described as follows for reference of fruit growers: 1. Young orchards from 1 to 5 years of age should use the earlier harvest period to avoid planting vegetables and other crops that are harvested later. Second, rational fertilization, the main organic fertilizer, but the amount of nitrogen fertilizer applied to promote the tree trunk, the current branch in time to mature, increase the tree's resistance to insects. Third, the use of physical control law, in the 5 days - 10 days before the frost, the young trees with 1:50-1:100 lime water dried, sprayed, cover the green branches, driving adults in the branches spawned. Fourth, drug control, full prevention and treatment of orchard spraying. The agent with better control effect is mainly cypermethrin 1500 times. Usually spray 2 times, interval 10 days or so, in order to eliminate the immigrants.
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