Sunburn disease causes brown spots in grapes how to prevent grape sunburn

Grape sunburn mainly occurs on grape ears. Fruit damaged, now light brown patches, after expansion, slightly concave, into brown, round scar, the edge is not obvious. Grapes are susceptible to anthrax at the affected sites. Grape coloring stage to mature stage stop occurring. The main reason is that the grape is burned by partial water loss or the leaves with high osmotic pressure compete for water from the grape fruits with low osmotic pressure under the high temperature condition of lack of leaf shadow.

grape sunburn

1. Choice of frame. Should choose trellis cultivation, grape planting, should increase fertilizer and water input, so that its rapid growth, the next year grapes grow into tree-shaped trellis, so that grape clusters grow under the shelf surface, avoid grapes are directly irradiated by sunlight.

2. Watering. Grape fruit set to early July, fruit tender, anti-Japanese burn ability is poor. At this time, less rain and high temperature, dry air, the most prone to sunburn disease, light part of the grape grain burned, heavy ear shaft necrosis, the whole ear dry. According to the weather conditions, moderate watering, reduce the temperature in the garden, reduce the damage of sunburn.

3. Thinning flowers and fruits, bagging ears. According to the soil fertility, age to determine the yield, in full flower before, flower ear separation, timely thinning flowers. Thinning out excess grapes, thinning fruit, spraying a fungicide, and then bagging. Waterproof, white paper bags should be selected, and ventilation holes should be left in the lower part of the paper bags. White paper bags absorb heat poorly and are safe to use. When bagging, avoid high temperatures at noon and dew periods.

4. Strengthen fertilizer and water management, enhance grape anti-burning ability. Grapes like fertilizer and water, should increase the application of organic fertilizer, timely watering, do a good job in pest control, so that the tree healthy, enhance disease resistance.