Orange leaf leaf aphid, also known as red leafhoppers, larvae known as map insects. A Coleoptera and Aceraceae family is only responsible for oranges. Adults feed the leaves and shoots on the back of the leaves, leaving only the leaf epidermis, making the damaged leaves appear transparent, and in severe cases, the leaves can be eaten with hundreds of holes and sores. The loss of young fruit resulted in reduced yields. The larvae are yellow, and they infiltrate into the leaves to feed on the leaves. The long curved curvilinear passages appear on the leaves. The damaged leaves are partially transparent. There are black lines formed by the larvae excretion, and the chlorosis will soon fall off. The severely damaged leaves will fall off in succession. , causing the tree to weaken.

Citrus sinensis is one of the major insect pests of citrus in our district. In recent years, the worm has been seriously afflicted in some citrus groves in our district. The scope of its damage has been gradually expanded, and the degree of damage has gradually increased. Tree vigor, quality and yield have a great influence.

First, the occurrence of features:

The orange leaf mink occurs one generation per year, and adults spend their winters and summers under cracks in citrus trunks, wounds, lichens, mosses or loose soil around trees. Generally, from late March to mid-April, when the temperature rises to around 15C, the overwintering adults start their activities, crawling on spring shoots, laying eggs, and laying eggs on young leaves. From April to June, it is the larval-damaging period. After July, the temperature rose, the adults lurked in summer, and they turned into winter. Adults are active during the day and often inhabit the back of the young leaves on the lower part of the canopy. They can fly and jump. They like to cluster and have suspended animation. They often inhabit the back of the young leaves on the lower part of the canopy. They mainly eat fresh leaves, and the leaves on the back of the damaged leaves are cut off. Only the skin remains. After hatching, the larvae enter the lower epidermis from the dorsal margin or the dorsal surface of the leaves to form curved tunnels. The tunnels often have 3-6 or more, and as many as 15 can be. The leaves are damaged in large numbers and easily fall off. At present, the worms commonly occur in towns (streets) such as Dasheng, Tongjing, and Shichuan. There are 8 to 42% of insects, and 20 to 188 of larvae. The occurrence is higher than in previous years. According to the meteorological department's forecast, the high temperature in June and the high local rainfall are suitable for the massive breeding of submarine leaf A. In addition, some of the old orchards are extensively managed and neglected, which provides favorable conditions for the occurrence of latent leaf aphid. It is estimated that this year's citrus latent leaf A is a biased year. Therefore, prevention and control must be conducted in a timely manner.

Second, control methods:

1. Agricultural control: Reduce the overwintering insects and larvae that enter the soil, combine the clearing gardens in winter and spring, plug the tree holes, and remove adult nests such as mold piles, lichens, and mosses on the trunk. After the fall of the victim leaf in April-May, it should be collected and burned in time to eliminate the larvae that remain in the leaves.

2, artificial control: the use of adult dead-dead habits, in the adult hair damage period, the ground covered with plastic film, vibration canopy, collecting fallen adults, concentrated burning.

3. Chemical control: Adults and larvae damage spring shoots and early summer shoots, and can be sprayed once during the active period of wintering adults and at the peak of their spawning period. 48% Chlorpyrifos EC 800 times, or 4.5% Crazy Microemulsion 2000 times can be used. When spraying, it must be even and thoughtful, especially when the back of the new leaf is wetted to ensure effective control of hazards.

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