Peach rot disease, also known as blight, causes the shoots to die after the peach trees are damaged, and ulcers are formed on large branches and trunks. If they are not treated promptly, the whole plant will soon die. The main causes of this disease are: cold injury and extensive management; inappropriate fertilization and years of autumn rain, peach dormancy delayed, so that the cold resistance of the tree. Specific prevention methods are as follows:
Strong tree disease prevention
1 Reasonable burden Determine the appropriate amount of results based on the tree's reproductive status and fertilization levels.
2 increase fertilization water should pay attention to increase organic fertilizer, increase phosphorus, potassium fertilizer and trace element fertilizer, but at the same time but more partial nitrogen fertilizer.
3 Preserving the roots and promoting the early defoliation of leaves is an important reason for weakening the tree vigor. It is necessary to timely prevent and control the diseases and insect pests that cause early defoliation of peach trees.
Attention to tree protection
1 Avoid freezing injury and daily burns Peach branches dry to the sun and the temperature difference between day and night is large, and it is easy to suffer freezing injury in winter. In the summer, there is no leaf cover on the sun surface, and it is easy to dead skin due to sun exposure. Prevention and control of freezing injury more effective measures, first, the trunk painted white, reduce the temperature difference between day and night; second is the stem bark antifreeze. The commonly used whitening agent formula is 12 to 13 kilograms of quicklime, 2 kilograms of crude liquid (about 20 bume degrees) of lime sulfur, 2 kg of salt, and 36 kilograms of clear water. Tu white can also prevent the branches from burning.
2 Protect the wound with a large incision and then apply varnish or thiophanate ointment, S-921 antibacterial agent and other protection. Large lesions should be bridged and protected in time after they are cured.
Timely treatment of lesions
1 Scrape Bark Peach rot disease generally damages the shallow layer of bark. Before the peach tree sprouts, the bark and necrotic tissue are scraped off. Most lesions can be scraped and most of the trees are removed. The germs, at the same time after scraping the skin, stimulate the tree body to produce callus to promote the healing of the lesion. After scraping off the diseased tissue, a combination of 7 parts of thiophanate-methyl WP and 2.5 parts of vegetable oil is applied to the diseased part, which has a good effect on curing lesions. It can also be applied to S-921 antibiotics 20 to 30 times. Liquid, 843 recovery agent stock solution, etc., to prevent the recurrence of disease.
2 The use of RBF fruit tree protective film agent to prevent RBF fruit tree protective film agent (Gokangbao) is a high-tech product developed by the Shanxi Province Orchard Research Institute. It is currently the latest special drug for controlling peach rot disease in China. It can be painted on the trunk or sprayed in full crown. It has the dual function of sterilizing and protecting the tree. According to the efficacy test, the cure rate of peach rot disease is 94%, the control rate is less than 5%, and the disease recurrence rate does not exceed 3%. In addition, the treatment of the diseased worms with liquid medicine can stimulate the growth of new skin, restore the tree vigor as soon as possible, and increase the yield of peach trees.
The prevention and control method is: Spring tree before and after the deciduous spray 1 (full crown) 150 to 200 times the liquid, can effectively prevent peach rot, and can reduce the water evaporation of the tree, inhibit the pumping, improve The ability of the tree to resist cold and drought; in the spring, 50 to 60 times liquid brushing the main peach tree (instead of lime sulfur), the parasitizing eggs in the gaps between trunks and main branches can be choked to reduce the occurrence of pests; After the tree scraper cures the rot disease, smear the sickle with 5 to 10 times liquid to promote healing.
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