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Causes and Prevention of Fruit Drop of Persimmon Tree
1, the lack of tree nutrition. Persimmons grow too weak, flower buds are in a state of starvation, flower development is not perfect, pollination and fertilization are poor, often lead to flowering or fruitless shedding. In addition, excessive nitrogen fertilizer application, excessive trimming, to promote leafy branches, branches closed, poor ventilation and light transmission, photosynthesis efficiency is not high, can also cause falling flowers. 2. The persimmon trees suffered from sudden drought after rain and fruiting, and the soil moisture changed drastically, which caused the sepals and fruits to produce stratification, resulting in fruit drop. 3, Persimmon worm damage. The first-generation larvae of the schizosactus were the most productive from mid-June to mid-July, and one larva could have 3-5 pods. In the case of serious damage to the fruit of Shizillae, it can cause more than 80% fruit drop. In addition to the above reasons, persimmon fruit drop is also related to improper management of fertilizer and water, and the characteristics of the varieties, the parts where the fruit is applied, and the concentration of spraying. Measures to Prevent Persimmon Fruit Drops: (1) Strengthen soil and fertilizer water management, improve tree nutrition, and increase tree vigor. The basal fertilizer should be applied every year. Water can be properly watered during the drought in spring. However, the early-stage fertilizer and water should not be too heavy, and the focus should be on the period of fruit enlargement. Nitrogen, phosphorus and potassium ratios of 10:3:9 are suitable for fertilization. (2) Trees that grow too vigorous can be girdled on the trunk or main branch. (3) Perform summer trimming. Sparse dense branches and improve the ventilation and light transmission conditions in the crown. (4) The flowering period can continuously spray 500ppm of gibberellin and 1% urea to stimulate ovary enlargement and increase fruit set. (5) Persimmon worms can be quickly killed, killed, and destroyed by pyrethroids to eliminate the worms.
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