Early defoliation of apple trees mainly includes brown spot, grey spot disease, round spot disease, round spot disease (Daxing disease) and deciduous leaf spot disease. In recent years, the disease of spotted leaf disease has been very serious in various places.
After the apple tree was damaged, it caused early defoliation and severely affected the tree vigor. If there are many fallen fruit trees, the fruit cannot develop normally, and it is easy to cause early fruit drop, which has a great impact on the yield.
Onset time and conditions
Early defoliation of apple trees started in June, with more incidence between July and August. The incidence decreased after August.
Rain and foggy conditions are the main conditions for disease epidemics. In early and rainy years, the onset was early and heavy. In spring drought, the incidence was late and light. In some areas, there was less rainfall, but the fog was heavy and the incidence was heavy.
The tree vigor has a great influence on the disease condition. The strong tree disease is light and the weak tree is very ill. The young tree disease is light, and the tree disease is heavy. The soil layer is light, the soil layer is thin, the lower part of the canopy is heavier than the top part; Other pest and disease hazards, as well as phytotoxicity, are also serious.
Control methods
1, do a good job Qingyuan. In the autumn and winter seasons, the leaves in the garden are cleaned and pruned to remove the remaining diseased branches of the trees to concentrate the production of manure.
2, strengthen the cultivation and management. Apply more organic fertilizer, in accordance with the principle of nitrogen control, phosphorus increase, potassium increase, rational use of chemical fertilizers, pay attention to foliar spray fertilizer. At the same time, scientifically implement large-scale changes to improve the ventilation and light conditions in orchards, and strengthen the prevention and control of other diseases and pests, so that fruit trees grow robustly, and improve disease resistance.
3, spray protection. Prevention of brown spot, gray spot disease, round spot disease, round spot disease (Daxing disease) mainly spraying 1200-1500 times esafety, 600-800 times killing, Dasheng, Nongkang 120, etc.; the main treatment of drug spray 8000- 10000 times Fuxing, Jiatuo, carbendazim, thiabendazole and so on.
Prevention of spot defoliation mainly spraying 1200-1500 times Yi Bao, 600 ~ 800 times Meng killing, agricultural resistance 120, Pude gold and so on. The combination of prevention and treatment is mainly sprayed with 8000-10000 times Fuxing, 5000-7500 Jin Luxi, 3000 times Wanxing, 600-800 times germicidal superiority, acetaminophen, and thiabendazole. Fungicides that prevent other early defoliation diseases, such as Bordeaux mixture, chlorpromazine, and carbendazim, have poor control effects, and they often cause serious losses.
Prevention time
Spraying once before the first infestation of the deciduous bacterium (8-10 days after anthesis) and the second time before the second infestation from the middle of June to the beginning of July can effectively prevent early defoliation happened.
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