The yellow thorn moth, commonly known as foreign pepper, has been damaged in walnut trees in recent years, and has evolved from a secondary pest to become a major pest that damages the walnut trees. The insects spread rapidly after the occurrence of the pests, often appearing fulminantly and causing serious damage. In general, the damage rate of the leaves of walnut trees is as high as 50%-60%. On average, there are 1-2 larvae of older larvae per leaf, and most of the leaves are eaten, severely affecting tree vigor and fruit development. The yellow-spotted moths occurred in Lulong County in 1 year. The old mature larvae were found to be overwintering at the branches of the crown, the main branches and the rough trunk. In general, the pupa began in early June, and the overwintering adult was from mid-June to mid-July, and the adult phototaxis was strong. The eggs were produced on the back of the leaves. The egg period is about 7-10 days. From early July to late August, the larvae are endangered for more than 50 days. A total of 7 larvae were larvae. The young larvae clustered and fed the lower epidermis and mesophyll of the leaves. They did not eat the epidermis to form round, transparent small spots. The leaves were reticular. The larvae gradually dispersed after they were large and fed at 4th instar. The leaves became holes, and larvae over 5 years old could eat the leaves, leaving only leaves and veins, and the leaves were mesh-like. The larvae have stings and touch the extreme pain of the skin, making it difficult to manage the summer and autumn. In late August, the mature larvae get overwintering. Control measures: 1. Biological control measures: Shanghai wasp is a dominant natural enemy of the yellow moth. In general, the parasitism rate of the green beetle is about 20%, and the parasitism is easily recognized. The upper end of the parasitoid has the small round holes or irregular holes left by the spawning of Shanghai wasp. Under the shade of walnuts, a protector was installed in March. The Shanghai Blue Bee Protector was made of a wooden cage with a length of 30Cm, a width of 30Cm, and a height of 40Cm. During the dormant period, the winter thorns of the yellow thorn moth are eliminated and concentrated in the protector. The green wasp climbs out of the protector after emergence and reproduces in the natural environment, while the yellow thorn moth is trapped and concentrated in the protector to eliminate it. After adopting the above measures, the parasitism rate of the winter moth is as high as 40%. It can effectively reduce the overwintering base number of the yellow moth. 2, black light trapping: from mid-June to mid-July, adult overwintering period, the field set black light trap adult. 3. Artificial control: When the young larvae cluster on the back of the leaves in early July, the young leaves of the young larvae can be cut in time to eliminate the young larvae; during the middle and late August, the mature larvae concentrate on human capture during the appropriate sites for finding scabs on the branches of the branches. Old and young, insects kill. 4. Spray control: Control the use of highly toxic pesticides, reduce the number of drug fights, and mainly use biopharmaceuticals, mineral pesticides and other pollution-free chemicals. In the early larvae at the beginning of July, the leaves were sprayed with 300-500 times of Bt emulsion, 10 days later with 25% of chlorenone and 2000 times of liquid, or 30% of mothraxine 2000 times.
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