Rot disease is one of the most important diseases of apple trees. Most of the spring diseases have formed typical ulcerous spots, and red-brown water-like micro-uplifted round-to-long-circle lesions appear on branches. The lesions are soft, easy to tear, and the hand is depressed. The yellow-brown juice flows out. The distiller's grains taste. After the lesions shrink, the edges have cracks, the diseased skin grows small black spots, and when the moisture is wet, small black spots spout out golden tendrils. Things.
Disease characteristics: Apple tree rot disease has two peaks of expansion in one year, in March to April and August to September respectively, and spring damage is more important than autumn. In the late autumn and early winter, the tree enters a dormant period, the resistance weakens, the germs invade the inner bark of the healthy tissue, and after the temperature rises in the early spring the following year, the disease spreads rapidly and enters the peak of onset. After the apple tree blooms, the pathogenesis of the apple tree resumes its growth and its incidence drops sharply and expands. In the summer and autumn, the growth of the tree gradually decreased, but it was stronger than in the spring. The bacteria attacked the healthy tissues and the disease was limited to the surface of the bark, forming a surface ulcer.
Prevention and control points: Spring is a good time to prevent apple rot disease. There are three prevention and control measures: First, we must pay attention to strengthening cultivation management. With the addition of organic fertilizers, it is possible to expand the soil around the tree disk in a lean manner, leave fruits at reasonable levels, and pay attention to drainage, etc. to increase tree vigor. Second, we must promptly remove the bacteria source. Clean up the diseased branches and dead branches in time and scrape the diseased skin. The plastic film on the ground is then cut off from the cuttings and then cleared out of the park. The branches under the saw do not need to be placed in the garden to prevent the spread of germs. Third, spray shovel remover. Before the sprouting in early spring, the whole tree was sprayed with 40% omeprazole WP 100 times to eradicate the surface bacteria.
During the growth of apple trees, it is necessary to timely cure rot disease spots, especially in the early spring and late autumn, to scrape the diseased parts and apply the drug. You can use Fuxing 40% flusilazole cream 500 times, or 55% carbendazimazole. Wettable powder 100 times liquid, or 5% bacteriostatic water solution 20 ~ 50 times liquid, etc. on the lesion is too large, affect the upper and lower nutrient transport branches, can be selected in the spring one year strong branch for scion, in the lesion upper and lower edge Implement multiple bridges and tighten them.
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