Technical measures for prevention and control of apple anthracnose leaf blight: prevention and control of apple anthracnose leaf disease should adhere to the principle of prevention and prevention, and comprehensive prevention and control work throughout the year.
Apple anthrax leaf blight is a very prevalent disease caused by anthrax. The disease is a new apple disease that has occurred in the apple trees of Jinshuai, Qinguan and Jonagold in recent years. The prominent feature of the disease is that the pathogens spread quickly and are extremely harmful, mainly damaging the leaves and fruits, causing a large number of early leaves and reducing the commercial quality of the fruits. The disease usually begins in early July, with rapid onset, strong resistance to bacteria, and difficult control, which poses a great threat to the apple industry.
(1) Prevent the spread of germs. Strengthen plant quarantine, prohibit the adjustment of scion, seedlings and diseased fruit from the diseased orchard to prevent the spread of germs.
(2) eradication of overwintering bacteria. For the diseased orchard, 100-200 times of copper sulfate solution can be sprayed once in the winter before the year of the year; in the middle and late March of the next year, 100-200 times of copper sulfate solution or other killing is sprayed before the apple is germinated. A strong eradication agent to eradicate the overwintering bacteria on shoots and dormant buds.
(3) Regular spray protection. Beginning in late May, alternately spray Bordeaux mixture and mancozeb, once every 10-15 days, to ensure that the leaves and branches are protected by the agent before each occurrence of more than 2 days of continuous rain.
(4) In case of continuous rain or advance spray or refilling. During the rainy season in July-September, according to the weather forecast, if there is continuous rainy weather about 7 days after the last spraying, spray protection should be carried out before the rain. If it is not sprayed in time before the rain, it should be sprayed in the intermittent rainy season. Manganese zinc or Bordeaux mixture.
(5) Pay attention to the quality of medicines and sprays. Selecting the quality and quality of the medicines produced and sold by the formal enterprises, the spray must be meticulous and thoughtful, especially the internal branches of the canopy, and the leaves should be uniformly applied to the front, back and fruit. At the same time, the higher the degree of atomization of the liquid, the better the control effect.
(6) Strengthen agricultural control. Renovate the drainage facilities before the rainy season to ensure that the water in the orchard is removed in time. Closed orchards should strengthen summer pruning and improve ventilation and light transmission conditions. After the disease occurs, the leaves should be removed in time to be sterilized outside the garden, and the tree body is sprayed and sterilized. Remove the diseased fruit early and take it out of the garden for destruction.
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