Chestnut disease, also known as epidemic disease, is a worldwide disease. The infected chestnut trees are infected with local trunks, the tree vigor is weak, and the trunks are festered, causing death. The source of the disease is chestnut bacterium, which harms the seedlings and trunks and branches of large trees. A round or irregular brown spot appeared on the bark at the beginning of the disease. Afterwards, the lesions continued to expand, and the trunk was soaked for one week and expanded upwards and downwards. The lesions were edematous and uplifted. After drying, the bark cracked longitudinally, and the mycelial layer turned yellowish brown after the fall.
Control methods
First, it is necessary to strengthen the management of chestnut fields, timely fertilizing, irrigation, cultivating, and rushing grass in order to increase tree vigor and increase disease resistance. Timely prevention and control of stem pests, prevent human and animal damage, reduce wound infection.
Second, we must scrape off the lesions on the trunk and large branches and reach deep into the xylem. Burn the bark and diseased branches thoroughly.
Third, we must pay attention to pest control. For larvae, deep plowing is combined with autumn and winter to remove weeds, pull out larvae, and make them die from drought and freezing. This will reduce the harm in the coming year. For adults, in mid-July and early August each year, 5% high-potassium hydropermethrin 1000-1500 times, or 10% bisporine 2000-fold, or 50% phoxim 1000-fold, are used to spray the crowns. Once the medicine, the insecticidal effect can reach 90%, or 5000 times of uremic insecticide can be applied. Spraying the canopy once in the middle of July and early August can reduce the egg laying rate of the adults by 80-90%. Individual larvae do not survive even if they hatch.
cosmetic
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