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First, the incidence of the law Apple rot bacterium is a weak parasitic fungus, with mycelium, conidia, molecular spores on the winter bark, spores spores spread by the rain. In the summer, the active growth period of apple trees is not conducive to the spread of pathogenic bacteria; however, the dying tissues in the skin layer and other parts create favorable conditions for the spread and infection of rot diseases, and the bacteria that invaded the bark expand after this and 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. There is a small peak of onset and the symptoms are obvious, but the expansion of the deep rest period is slow.
Second, prevention and cure measures The curettage rule is based on the characteristics of pathogenic spores spreading by rain in the summer. After scraping off the dying tissues in the fallopian layer, the stems on the trees, and the branches of diseases and insects in the autumn, apply 50 times 4% of the agricultural anti-720 fruit tree liquid to eliminate the latent pathogenic bacteria. Infested base. Combining with other diseases to control fruit trees, meticulously and thoroughly spraying 4% agricultural anti-120 fruit tree type 600-800 times solution or 1:2:200 times Bordeaux mixture solution 3-4 times a year to eradicate the pathogenic bacteria in the period of latent infestation and fundamentally control The onset of dormancy.
Autumn Prevention of Apple Tree Rot Disease
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.