What causes physiological fruit drop in persimmon trees?
What is physiological fruit drop in persimmon trees? Please provide an introduction on how to prevent it. The causes of physiological fruit drop in persimmon trees and prevention and control methods are as follows: 1. Factors behind physiological fruit drop in persimmon trees. Due to improper management, persimmon trees drop a large amount of fruit 1 month after the flowers fade, with the peak fruit drop period occurring about 20 days after full bloom, and then another minor fruit drop in August...
What is physiological fruit drop in persimmon trees? Please provide an introduction on how to prevent it
The causes of physiological fruit drop in persimmon trees and prevention and control methods are as follows:
1. Factors behind physiological fruit drop in persimmon trees.
Due to improper management, persimmon trees drop a large amount of fruit 1 month after the flowers fade, with the peak fruit drop period occurring about 20 days after full bloom, and then another minor fruit drop in August. The causes of fruit drop in persimmon trees are relatively complex, roughly including the following factors: 1. Poor nutrition and nutrient imbalance; during the fruit drop period, new shoots continue to grow, and nutrients are consumed by new shoot growth. 2. Insufficient light; shading or excessive rain reduces photosynthesis, so that some fruits in unfavorable nutritional positions fail to receive sufficient nutrients and drop. 3. Insufficient water and excessive dryness affect normal physiological functions
and lead to fruit drop. 4. Poor pollination causes the ovary to shrink on its own.
2. Strategies to prevent physiological fruit drop in persimmon trees.
1. Strengthen fertilization and management, maintain vigorous tree growth, and enhance leaf photosynthesis, thereby regulating the distribution of nutrients within the branches and easing the conflict between growth and fruiting over nutrients. 2. Ensure sufficient light conditions, drain excess water promptly during the rainy season, irrigate promptly during the dry season, and keep the tree growing vigorously so the fruit develops well. 3. Properly interplant pollinator varieties and keep more bees so that pollination and fertilization proceed smoothly. 4. Use artificial supplementary pollination, which can effectively prevent physiological fruit drop. Most excellent persimmon varieties have only female flowers; although varieties with male flowers may be interplanted, they are, after all, only a minority. To ensure good fruiting and less fruit drop in persimmon trees, artificial supplementary pollination is a link that cannot be ignored. However, because regional climates differ, persimmon flowers open at different times, so artificial pollination should also be carried out in 3 to 4 rounds for reliable pollination. 5. Girdling vigorously growing young trees can promote flower bud differentiation and bring fruiting earlier. For mature trees that have reached full fruiting age, it can reduce physiological fruit drop and advance the fruit ripening period. The suitable time for girdling is generally when half of the persimmon flowers are open; if done too late or if the girdling width is too large, the wound will be difficult to heal, which will cause the tree to become too weak and may even lead to the death of the whole branch or the entire tree. The girdling width should be limited to 1.5 cm. Girdling can bring benefits in the same year, but this method must be used with caution and according to the tree's condition. It can be applied on the trunk and the base of main branches, and can also be applied at the base of fruiting branches or on fruiting mother branches, but it should not be done every year, otherwise the tree will tend to become even weaker and its lifespan will be shortened. 6. Spraying 50 PPM gibberellin during the young fruit stage or using 0.5% urea as a foliar topdressing also has a good effect on reducing fruit drop.
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