In order to improve the control effect of chestnut pests and diseases, according to the climate, chestnut habitat, pest habits, determine the control object, period and methods, rational use of drugs, reduce pesticide use. If the winter and spring are cold and rainy, the damage of the chafers is lighter, and the chestnut disease is more prevalent. In June, more rainy days occur, and pruning weevils and spider mites (small chestnuts) are lighter. Chestnut germ disease and anthrax occur more severely. In July, peach aphid, chestnut, and anthracnose caused similar symptoms to chestnut damage. First, some of them died of stabbing, and gradually expanded. Late chestnuts split and fell. In recent years, excessive use of boron fertilizer and spray of organophosphorus pesticides have resulted in poisoning of chestnut leaves. The affected chestnut leaves have shrunk, curled, and become chlorotic. The leaf margin has turned red and the chestnut leaves have fallen off. This situation is relatively common, people mistakenly believe that pests and diseases, blindly prevent and control, increase the level of chestnut damage. Comprehensive prevention and control: 1. Manual removal: In April, chestnuts are extracted from fresh shoots. If there are tumors, they can be removed at any time, which can reduce the damage of the chestnut bees that year and the following year. From mid-July, picked up 10 to 15 days apart until chestnuts are harvested. Picking up chestnuts burned. Pruning the weevil, from the middle of June to the end of July, picking up the chestnut pods on the ground and collecting them 5 to 7 days apart, can reduce the annual pests. 2. In addition to chowder complex: Mao Li is a pruning weevil, chestnut snow picture, chestnut-eating weevil another host, clear chestnut garden within 500 meters around the chestnut. In winter, replanting chestnuts and destroying pests in overwintering areas can reduce the damage caused by pests. 3. Adapted varieties: like early-ripening varieties of susceptible susceptors such as dihydrate, the output is unstable, can be changed to Dahongpao, sticky floor, leaf Lili and other high-quality, high-yield, stable production, insect-resistant, disease-resistant varieties. 4. Physical control: Scarab, Myzus persicae, and Longhorn have strong phototaxis. They can be seduce by black lights or ordinary lights. The lights are set on the slopes 50 to 100 meters away from the chestnut yard, behind the house or on the roadside. The light time is from 8:00 to 10:00 in the evening and the trapping period is from early April to mid-May. Trapping effect is better than pesticide control. 5. Scientific use of drugs: chafer, pruning weevils, peach aphid and other fruit, leaf pests can choose high efficiency cypermethrin, trichlorfon, oxymatrine and other pesticides. Chestnuts, chestnuts, red spiders, and other sucking insect pests, pests use avermectin, imidacloprid, acetamiprid and other high efficiency, low residual insecticide, acaricide. Chestnut anthracnose, chestnut disease use copper preparations, agricultural anti-120, thiophanate-methyl, carbendazim and other fungicides. Prevention of disease chestnut plaster diesel emulsion.
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