In the production of grapes, whether it is cultivated in open field or cultivated in protected areas, if it is improperly managed, there will be phenomena of falling flowers and falling fruit. If it cannot be controlled in time, the falling and fruit falling will be even more serious. The author's investigation and analysis in the countryside suggested that there are four main reasons for the falling of grapes:
1. In case of rainy weather or temperature fluctuations, affecting normal pollination of grapes, field drainage and artificial pollination work should be done in time to increase the pollination rate. In addition, new high-fat membranes should be sprayed on the tree in advance to reduce flooding. Ensure that the tree vigor is strong in the middle period, enhance the resistance of the tree, reduce the number of falling flowers and fruit, and can effectively increase the fruit setting rate.
2. When the nutrients stored in the tree during the growth period are insufficient, incomplete flowering of the grapes, poor development of the embryonic plants, and low pollen germination rate result in a large amount of fruit drop and a low fruit setting rate, especially for a variety such as Kyoho. The inherent genetic characteristics of embryos have the characteristics of incomplete development of embryos. 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 time to supplement the 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 particular, attention should be paid to the prevention of imbalance in the nutritional balance of the tree, resulting in falling fruit. When there is a contradiction between the vegetative growth and reproductive growth of the vine, the two will compete with each other for nutrients. Since the vegetative growth exceeds reproductive growth, the fruiting and fruiting are worsened. Therefore, to combine the foliar fertilizer, before the grape bloom, young fruit period, fruit expansion period, spray the fruit and sedatives to achieve tree-balance and reduce fruit drop.
3, in the production of grape shoots generally take the right time to take heart and remove the auxiliary tip and other measures, you can advance and shorten the flower bud differentiation, the results of the branch before flowering, and the tree spray growth retardant "Gold micro" multi-purpose 250 Double liquid can play a role in protecting the fruit.
4. In July and August of each year, the rain has more humidity and 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, before and after germination should be sprayed 1:0.5:200 Bordeaux mixture, the recent spray of thiazole zinc 600-800 times and 6000 times liquid The natural brassin "Shufeng 481" can also be sprayed with 70% of Antares, which is good for preventing and treating 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.
1. In case of rainy weather or temperature fluctuations, affecting normal pollination of grapes, field drainage and artificial pollination work should be done in time to increase the pollination rate. In addition, new high-fat membranes should be sprayed on the tree in advance to reduce flooding. Ensure that the tree vigor is strong in the middle period, enhance the resistance of the tree, reduce the number of falling flowers and fruit, and can effectively increase the fruit setting rate.
2. When the nutrients stored in the tree during the growth period are insufficient, incomplete flowering of the grapes, poor development of the embryonic plants, and low pollen germination rate result in a large amount of fruit drop and a low fruit setting rate, especially for a variety such as Kyoho. The inherent genetic characteristics of embryos have the characteristics of incomplete development of embryos. 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 time to supplement the 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 particular, attention should be paid to the prevention of imbalance in the nutritional balance of the tree, resulting in falling fruit. When there is a contradiction between the vegetative growth and reproductive growth of the vine, the two will compete with each other for nutrients. Since the vegetative growth exceeds reproductive growth, the fruiting and fruiting are worsened. Therefore, to combine the foliar fertilizer, before the grape bloom, young fruit period, fruit expansion period, spray the fruit and sedatives to achieve tree-balance and reduce fruit drop.
3, in the production of grape shoots generally take the right time to take heart and remove the auxiliary tip and other measures, you can advance and shorten the flower bud differentiation, the results of the branch before flowering, and the tree spray growth retardant "Gold micro" multi-purpose 250 Double liquid can play a role in protecting the fruit.
4. In July and August of each year, the rain has more humidity and 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, before and after germination should be sprayed 1:0.5:200 Bordeaux mixture, the recent spray of thiazole zinc 600-800 times and 6000 times liquid The natural brassin "Shufeng 481" can also be sprayed with 70% of Antares, which is good for preventing and treating 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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