Common Summer Pests and Diseases of Apple Trees and Their Control Methods
What pests and diseases of apple trees need to be controlled in summer? Here are several pests and diseases that may need to be controlled in summer apple orchards for reference: 1. Peach fruit borer: The larvae bore into the fruit and cause damage, resulting in deformed fruit development and the formation of "monkey-head fruit," "bean-paste-filled fruit," and the like. Commonly used pesticides are 2.5% Kung Fu at 1500x dilution, or chlorpyrifos...
What pests and diseases of apple trees need to be controlled in summer? Please explain.
The pests and diseases of apple trees that need to be controlled in summer can refer to the following:
1. Peach fruit borer: The larvae bore into the fruit and cause damage, resulting in deformed fruit development and the formation of "monkey-head fruit," "bean-paste-filled fruit," and the like. Commonly used pesticides are 2.5% Kung Fu at 1500x dilution, or chlorpyrifos (imported trade name Lorsban) at 1000x dilution.
2. Ring rot and anthracnose: In the early stage of ring rot, water-soaked brown small spots form on the fruit surface and quickly spread outward into large brown lesions. In the early stage of anthracnose, small brown round spots appear on the fruit surface, and after enlarging, the lesions become conical and sink into the flesh. A spray of 50% sulfur suspension concentrate at 200x dilution, or Lunfujing at 300-500x dilution, or Shinaoning at 300x dilution can be used.
3. Pest mites: After July, when there are an average of 7-8 active mites per leaf, pesticide spraying should be carried out for control. The commonly used pesticide is 4.5% beta-cypermethrin emulsifiable concentrate at 2000x dilution plus Zhumanjue.
4. Valsa canker: In July-August, the canker pathogen begins to expand in the fallen bark layer of the fruit tree, forming surface ulcers. For this reason, frequent scraping and disinfection must be maintained, the scraped diseased remnants should be removed from the orchard and buried deep, and medicine should be applied to the lesions (generally undiluted Fubiqing or a 2x dilution gives the best effect). At the same time, apply medicine on the trunk, main branches, and large side branches to eliminate the initially infecting pathogen. Be careful not to let the solution touch the leaves to avoid phytotoxicity.
5. Asiatic apple leafminer: Early July and early August are the key periods for controlling the second and third generations of Asiatic apple leafminer larvae. Using 2.5% Kung Fu at 1500x dilution gives a relatively good effect, and it can also control peach fruit borer at the same time.
If these diseases occur at the same time, fungicides and insecticides/acaricides can also be used together for simultaneous control, namely carbendazim at 800x dilution, or Bidelilu at 800x dilution, or Junlimie at 800x dilution, plus 2.5% Kung Fu at 1500x dilution, or chlorpyrifos at 1000x dilution, or beta-cypermethrin at 2000x dilution plus Zhumanjue, and then add Jiabeiwei at 2000x dilution.
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