At present, the grape is in the period of fruit enlargement. Whether it is cultivated in the 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. Zhang Zhicheng, an expert in fruit mixing at the Northwest A&F University, explained that there are many reasons for the grape falling and fruit falling mainly in the following aspects:
Rainy weather
In case of rainy weather or temperature fluctuations affecting normal pollination of grapes, timely drainage and artificial pollination should be done to increase the pollination rate. In addition, new high-fat membranes should be sprayed on the trees in advance to reduce flooding and ensure the trees. The mid-term trend is robust, which increases the resistance of the tree and reduces flowering and fruit falling, which can effectively increase the fruit setting rate.
Insufficient nutrients in the tree
When the nutrients stored in the tree during the growth period are insufficient, incomplete flowering of the grapes, poor embryonic development, and low pollen germination rate result in large fruit drop and low fruit setting rate. If the tree stores insufficient nutrients, the fruit drop 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 compost, 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 imbalances in the nutritional balance of the tree, resulting in falling flowers. 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 impact
Entering July and August every year, the rain is more humid, and there are more hot weather. 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 selection of Kyoho, white banana, black Olin, Red Fuji and other disease-resistant varieties, should be sprayed before and after germination of Bordeaux mixture, fruiting period can be sprayed silver fertilizer 70% Antai, better control of the above diseases. According to the actual situation of their own fruit trees, it is recommended that they be treated differently and targeted for prevention and treatment.
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