Causes
Grape grape-deficit grape is in the period of rapid fruit enlargement, and the swelling rate of fruit is much faster than the absorption and transportation speed of calcium, boron and other nutrients. In addition, the degree of calcium deficiency in the orchard with lack of soil compaction and organic matter is even more severe. It created conditions for the onset of the disease.
The management of extensive branches, staggered leaves, poor drainage between rows, low-lying orchards, low-temperature insulation sheds and shelters, are prone to sunburn. There are no leaves on the outside of the grape to cover the orchard branches, causing the young fruit to suffer direct sunlight. After a continuous rainy weather, it suddenly encounters a high-temperature sunny day and prone to sunburn.
Prevention
The use of a scaffolding type for proper close planting allows the ear to be in a cool shade. Appropriate fertilizer is applied to induce deep root group development, increase tree vigor, and improve resistance to stress.
To prevent excessive waterlogging or excessive application of fertilizers at the right time in the high-temperature incidence period appropriate amount of irrigation, evaporation, timely watering to reduce the body temperature, coordinate the nutritional balance of plants, improve the degree of grape coloring, avoid sunburn.
Irrigation with humic acid, microbial agents and other substances to improve the root environment, promote root growth, enhance absorption capacity. Control the amount of nitrogen fertilizer application, control strips, wipe off secondary shoots and reduce leaf transpiration. Calcium, boron, increase peel flexibility and water retention, reduce sunburn.
Vitamins
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