Apricot leech is a typical physiological disease. There are many causes of the disease, such as bruises, insects, frostbite, sunburn, mechanical trauma and so on. In the high-replacement or large-branch renewal, it is easy to cause gummy disease. Summer pruning is too heavy, fertilization is improper, soil is heavy, acidity is too strong, pesticides are used improperly, resulting in phytotoxicity, etc., all can induce gummy disease. Symptoms: Flowing gums mainly occur on branches and fruits. When trunks and branches are damaged, transparent gums flow out in the spring. After contact with air, the gum gradually turns brown and becomes a soft and soft plastic block, which eventually turns into a dark brown hard plastic block. . Flowing gum is often swollen and the cortex and xylem of the diseased part gradually become brown and rot, and is then infected by saprophytic bacteria, which severely weakens the tree vigor. The flow of fruit occurs mostly in the wound, and the glue sticks on the surface of the fruit, causing the growth of the fruit to stagnate and the quality to decline. Pathogens: Pathogens of apricot tree rune disease are Verticillium sp. and several other species. Is a semi-known fungus, plexus spores, plexiaceae. It was initially determined that the pathogenic bacteria were saprophytic bacteria that had invaded after being flowed by physiological lesions, and that the invasion of the pathogens further aggravated the flow of glue. Incidence regularity: The conidia of pathogenic bacteria of the disease, through the spread of wind and rain, invade the wound or fluid. The pathogenic bacteria can lurk in the tissues of the victim's branches and xylem, producing conidia in the dead cortex and becoming a source of infection. Control methods: 1 Avoid causing mechanical damage to the tree. In the event of injury, the wound should be protected with lead oil and other preservatives in a timely manner. 2 Eradicate pests in time and control the amount of nitrogen fertilizer. 3 In the dormant period, apply the colloidal bactericide (formulated by the ratio of 1 kilogram of latex + 100 grams of 50% tetromycin) to smear lesions to kill pathogens.
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