The apple anthracnose pathogens overwintered on the dead branches and dead fruits of the branches of the mycelium, and spread by insects and wind and rain. At the beginning of the disease, the fruit surface showed a light brown immersed small round spot and rapidly expanded. The northern region can occur from June to September, with the period from July to August as the peak period, especially after the rain. Low-lying orchards with poor drainage and weak fruit trees are early and severe. Prevention and control should pay attention to the following aspects:
Timely removal of the source of the disease combined with winter pruning to do a good job in the Qingyuan, and carefully remove the diseased dead fruits and dead branches on the tree. In the growing season, the diseased fruit is removed in time to prevent repeated infection of the bacteria.
Strengthen cultivation management and strive to improve the ventilation and light transmission conditions of the orchard, and timely drainage in the rainy season. Add organic fertilizer and control the amount of fruit to enhance the tree potential and improve disease resistance. At the same time, attention is paid to the application of foliar fertilizer , especially calcium fertilizer. According to years of experience, under the condition of sufficient calcium supplementation, apple anthracnose is relatively relieved.
Early prevention is mainly prevention before bagging. Spraying “sterilized strong†(12% myclobutanil) 1000 times solution before germination of fruit trees has a good effect on reducing the source of overwintering bacteria. The growth period generally starts from about 10 days after the flowering, and after 7 months, the priority is given to the central diseased disease and the critically ill area, and the drug is sprayed continuously for 3 to 4 times. The specific spraying period depends on the rainfall situation. It insists on spraying after the rain, spraying more rain, and spraying less rain.
Commonly used medicines are MBP 800 times liquid or "Ai Mu" (70% thiophanate-methyl) 1000 times liquid or Bison 1000 times liquid or "Antibacterial" (72% Fufu zinc) 1000 times liquid alternately used. , once every ten days. In order to prevent and control other diseases, the top (80% tebuconazole water dispersible granule) 8000 times solution can be added at the same time.
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