Hazard characteristics When sunburn occurs on the fruit, the fruit surface produces a brownish-brown near-round spot with no obvious edge. The fruit surface first shrinks and then gradually sag, and the serious ear becomes a dried fruit. Tendons and shoots with young shoots that are not yet lignified can also suffer from sunburn injuries, causing tipping or wilting of the leaves.
The cause of the disease is usually from mid-June to early July (coloring and ripening of the ear). The disease usually occurs in the ears that are exposed to the sun. The reason is that the tree lacks water and the water supply is insufficient. When the water absorption in the root system is insufficient, the amount of leaf evaporation is large, and the osmotic pressure is increased, resulting in unbalanced fruit moisture, sunburn occurs. Sclerotherapy can also occur when roots or burning roots occur in the root system. Large particles in production are prone to sunburn. In some cases, sunspots may appear in shades of the shoots and fruits as they are moved by cropping, toppings, and vines, or when the temperature suddenly rises.
Prevention methods Strengthen cultivation management: Proper deep fertilization, induce root groups to deeper development, increase tree vigor, and improve resistance to stress; appropriate dense planting, use of scaffolding type, so that the ear is in cool and cool; prevent waterlogging or over-fertilizing Phenomenon; In the high temperature onset of timely irrigation, adequate water evaporation, large amount of watering in time to reduce plant body temperature, avoid sunburn. Spraying and cooling: In the hot weather after the rainy season, spraying 0.2% potassium dihydrogen phosphate solution or 5% turfgrass leaching solution or 27% high-fat film emulsion 80 to 100 times liquid on the foliar and ear 2 or 3 times, There is a certain preventive effect on sunburn.
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