In the high-temperature and rainy season, apple aphid disease has a high rate of 40% to 50% in the orchard fruit damage rate, causing great economic losses to farmers.
Apple anthracnose mainly damages the fruit. In the early stage of disease, the fruit surface appeared light brown immersed in small round spots and rapidly expanded. The flesh is soft and rot-flavored, the fruit heart is funnel-shaped and brown, and the surface is subsidence. It is characterized by alternate shades of shades (if the environmental conditions are appropriate, the lesions decay rapidly without appearing the bolls). When the lesions were expanded to 1 to 2 cm, many small spots were formed on the surface of the lesions, which turned black and slightly concentric. In moist conditions, the lesions gradually turn dark brown, and eventually the whole fruit rots and falls off. There is also water loss and shrinkage and black stiff fruit remains on the tree. This kind of stale fruit is the main source of bacteria in the second year of early infection. one. Apple anthracnose pathogenic bacteria are mycelium overwintering on the branches of the ulcers on the shoots and on the stagnant fruit, and spread by insects and wind and rain. It can occur in the northern region from June to September, and it takes the period from July to August as the peak period, especially High temperatures occur immediately after the rain. Poorly drained orchards and trees with weak trees are early and heavy.
The current prevention and control measures should be taken: First, cut off the source of disease: found the disease, immediately removed, concentrated burned or buried in order to prevent the re-infection of bacteria. Second, chemical control: the whole tree continuous spray 2 times 50% thiophanate-methyl WP 500 times, 75% chlorothalonil WP 600 times or 80% anthrax MET WP 500 times and other fungicides The control of anthrax is better.
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