Many pests and diseases may occur during the planting of peach trees. One of the diseases, called leaf shrinkage, is very headache for the farmers. The occurrence of leaf shrinkage will reduce the yield and quality of peach trees, affecting the economic benefits of fruit farmers. The following small series is a simple introduction for the prevention and treatment of peach tree leaf shrinking disease.
Peach tree leaf disease symptoms
The disease mainly affects the leaves and can infect new shoots and fruits. The main symptoms are as follows:
1. After the germination of the diseased tree, the young leaves are red-curled, and then the leaves are browned and brown, and a layer of gray-white powder is formed on the surface of the diseased leaves.
2. The spring shoots are prematurely falling, weakening the tree potential, not only affecting the current year's output, but also adversely affecting the second year's output, and even leading to premature aging of plants. The disease will also harm fruit trees such as plums and plums.
3. When the new shoots are damaged, they turn gray-green or yellow-green, and the internodes are shortened and the leaves are clustered. In severe cases, the diseased parts are distorted and dead.
4, flowers and young fruit mostly distorted, can reduce production by 30% -80%.
The pathogenesis of peach tree leaf reduction
The pathogens are over-summered with ascospores on the bark of the peach bud scales and branches, and continue to multiply when the temperature is appropriate. The spores overwinter on the bark and scales or into the leaves. When the second spring peach buds sprout, the spores are germinated to produce germ tubes that directly penetrate the leaf epidermis or enter the shoots through the stomata for initial infection. Invaded by the leaf back before the blade is deployed, and the blade is invaded by the leaf surface after deployment. The ascospore layer is formed in the early summer. And produce ascospores and spores.
The occurrence and damage of peach leaflet disease is closely related to the climate in early spring. In early spring, the temperature is low (10-16 ° C), the rain is more, the air is humid, and the incidence is more and more serious; on the contrary, the incidence is mild or not. In the fall from late August to late September, if the climate is similar to early spring, it will occur slightly.
What kind of medicine is used in peach tree
(1) Agricultural control. When building a new Taoyuan, choose a variety that is both high-yield and disease-resistant. For the peach orchard entering the fruiting period, it is necessary to do a good job in soil, fertilizer and water management, carefully trim and trim, and improve ventilation and light transmission conditions. In the case of serious disease, the peach orchard should be topdressed and irrigated in time. Spraying the fruit and fruit will make the nutrient delivery tube thicker, enhance the tree potential and improve disease resistance. In April-May, combined with the trimming of the growing season and the prevention and control of the larvae of the larvae of the red-necked larvae, it was found that the leaves of the sclerotia were immediately removed and burned intensively. Spraying the tree guard general 1000 times liquid sterilization, inhibiting the spread of the bacteria.
(2) Chemical control. In the dormant season, spray the tree guard general 1000 times liquid to eliminate the winter pathogens. When the spring peach buds begin to expand, it is a key period for the prevention and treatment of peach leaf disease. Spraying tree general 1000 times liquid, or 70% methyl thiophanate WP 1000 times, or 50% carbendazim suspension 1000 times liquid. In the 3-6 months of the peach tree growing season, before the arrival of the leaf to the high temperature and dry weather, you can use methyl thiophanate or carbendazim to add a new high-fat film to keep warm and protect the drug. The lesions of early leaf defect were about 0.2 cm in diameter, and the fungicide was sprayed, and the lesions were significantly inhibited.
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