When the grapes are ripe, a large amount of fruit must fall off and water should be reduced. Whether it is cultivated in open field or under protected cultivation, if it is improperly managed, there will be flowering and fruit falling. If it cannot be controlled in time, the fruit drop will be more serious. Causes of falling grapes and falling fruit are mainly due to the following aspects:
Rainy weather: In case of rainy weather, or when the temperature is high or low, affecting the normal pollination of grapes, field drainage and artificial pollination work should be done in time to increase the pollination rate, and in addition, a new high fat film should be sprayed on the tree in advance to reduce flooding. To ensure that the tree vigor is strong in the middle period, enhance the resistance of the tree, reduce the number of falling flowers, and effectively increase the fruit setting rate.
Inadequate nutrient of the tree: When the nutrient stored in the tree during the growth period is insufficient, incomplete flowering of the grape is increased, the embryonic development is unfavorable, and the pollen germination rate is low, resulting in large amount of fruit drop and low fruit setting rate. If the tree stores insufficient nutrients, falling and fruiting will be more serious. Therefore, most of the nutrient supply of grapes should be completed in the early growth period.
It is worth noting that the best period for supplementing nutrients is after the grapes are harvested in the fall and before the cold. Generally, two-thirds of the total amount of nitrogen fertilizer, the total amount of phosphate fertilizer, and half of the total amount of potash fertilizer are used as the base fertilizer, which is applied together during the top-dressing period to ensure the nutrient demand of the grape in the early growth period.
In addition, we must guard against the loss of fruit and vegetables caused by imbalanced nutritional balance of the tree. When there is a contradiction between the vegetative growth and reproductive growth of the vine, the two will compete for nutrients. Since vegetative growth exceeds reproductive growth, resulting in increased flowering and falling fruit, it is necessary to combine the foliar fertilizer in the grape before flowering, young fruit During the fruit enlargement period, spray each fruit with Zhuang Ti Ling to achieve balanced tree vigor and reduce fruit drop.
Disease effects: Every year in July and August, the rain is highly humid, and the weather is hot. At this time, the grapes are very prone to diseases. Downy mildew, anthrax, powdery mildew, and black pox can cause large amounts of fruit to fall off. In addition to the use of Kyoho, white bananas, black Olin and other disease-resistant varieties, should be sprayed before and after germination Bordeaux mixture, fruiting period can be sprayed silver fertilizer 70% Antai, better control of the above diseases.
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