In the prevention and control of apple tree rot, over the years people only paid attention to the prevention and treatment of the spring, but they ignored the prevention and treatment in the fall, resulting in a high recurrence rate of the disease and could not be completely cured. However, according to the law of the rot disease, the application of a curettage in the spring was changed to prevention in autumn. Mainly combined with spring prevention and treatment, and bridging large lesions, can receive good control effect.
First, the incidence of the law
The apple rot bacterium is a weak parasitic fungus. It is wintering on the bark with mycelium, conidia, and molecular spore angles. The spores of the disease are spread by the rain splash. In the summer, the active growth period of apple trees is not conducive to the spread of pathogenic bacteria; however, the dying tissue in the skin layer and other parts creates favorable conditions for the spread and infection of rot, and the bacteria that invaded the bark expands to form a small one. Epidermis ulcer spots. When the tree enters the dormancy period, its ability to live is reduced and its incidence is accelerated. A small peak of onset occurs and the symptoms are obvious, but the expansion of the deep rest period is slow.
Second, prevention and control measures
1. Scrape Treatment: According to the characteristics of spores spreading by rain during the summer, scrape off dead tissue from the skin layer, cockroach and pests on the tree in the autumn, and apply 50 times 4% of the anti-macro fruit tree liquid to eliminate pathogenic bacteria. Dyeing base.
2. Combine prevention and treatment of other diseases of fruit trees with meticulous and thorough spraying of 4% agri-resistance 120 fruit tree 600-800 times solution or 1:2:200 times Bordeaux mixture 3-4 times a year to eradicate the pathogenic bacteria in the latent infestation period. Fundamentally controls the onset of dormancy.
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