Apple trees need to prevent sunburn in July and August
Sunburn disease is also called sunburn disease. The victim suffers from dehydration and scorch on the sunny side, resulting in reddish-brown near-circular spots. The spot gradually expands, resulting in dark brown lesions and yellowish halos around, seriously affecting the value of Apple products. . July-August is a critical period for the prevention of sunburn, and effective measures should be taken to reduce the incidence of the disease.
When water is dripped in time when there is a drought, the irrigation conditions should be immediately filled with water to increase the moisture content of the soil so that the fruit can be quickly replenished when the temperature of the fruit is increased due to increased respiration and the occurrence of sunburn disease is reduced.
Pay attention to the bag fruit position in the upper part of the canopy, the south, especially the southwest, the most direct sunlight, the general occurrence of sun-drenching disease of the film bag bag (the temperature inside the film bag is 3 °C ~ 5 °C higher than the outside). Therefore, the fruits of these parts are usually covered with a paper bag or a paper bag directly in order to reduce or avoid the occurrence of sunburn.
The tree plate is covered with high temperature and drought before it is covered with a layer of straw, weeds or wheat stubs, etc., on the tree plate, which can not only protect the earthworms, but also reduce the temperature of the soil, and also prevent sunburn.
Covering the fruit surface with fruits that are prone to sunburn, covering the sun's surface with leaves with large leaf area and broadleaf grasses can reduce direct sunlight and reduce sunburn.
Paste a white paper on the sunny side of the sun-burning fruit paste a piece of white paper with emollient oil to reflect sunlight and prevent Sunburn.
Spray lime milk Apply a layer of lime milk to the sunny side of the apple, which can not only reflect light, but also reduce the occurrence of sunburn. It can also sterilize.
Foliar spray fertilizer Spray Meifeng or Qirui amino acid fertilizer 400 times 2-3 times from the beginning of July to the end of August. Each interval of 15 days will not only reduce the occurrence of sunburn, but also promote the development of fruits and improve the fruit. quality.
Spray water in the evening to spray water on the crown when the sun goes down or obliquely, which can also reduce the occurrence of sunburn.
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