Sunburn disease is also called sunburn disease. The victim's apple is characterized by dehydration and scorch on the surface of the sun, resulting in reddish-brown and near-circular spots. The spots gradually expand. Finally, dark brown spots are formed and there are 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.
1. Timely irrigation. In the absence of drought, irrigation conditions should be immediately filled with water to reduce the incidence of sunburn.
2. Tree tray cover. Before the advent of high temperature and drought, a layer of 20 cm thick straw, grass or wheat bran etc. is covered on the tree tray, which can not only protect the earthworms but also reduce the temperature of the soil, which can prevent sunburn.
3. Cover the fruit surface. In the sun-facing surface of fruits that are prone to sunburn, the tung leaves, ramie leaves, or broadleaf grasses with large leaf areas can be used to reduce direct sunlight and reduce sunburn.
4. Paste the white paper. Apply a white paper on the positive side of sunburn-prone fruit to reflect sunlight and prevent sunburn.
5. Spray lime milk. A layer of lime milk is applied on the apple's positive surface, which can reflect light, prevent sunburn, and sterilize.
From the beginning of 6.7 months to the end of August, spraying Meifeng or Qirui amino acid fertilizer 400 times for 2 or 3 times, each time for 15 days, it can not only increase drought resistance, reduce sunburn, but also promote fruit development and improve fruit quality. Make the flower buds full the following year.
7. Spray water in combination with spraying the evening. When the sun goes down or obliquely, the canopy can be sprayed with clear water to reduce sunburn.
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