There are two reasons for the fruit drop of the persimmon: one is the physiological fruit drop caused by the physiological disorder of the persimmon; the other is the fruit drop caused by anthrax, kaki disease and other pests. The fruit farmers friends must take effective measures according to the reasons for the drop.
Physiological fruit drop
Physiological fruit drop occurred mostly after flowering until mid-July. The fruit drop before and after wheat harvest was the most serious, accounting for 80% of the total number of fruit droppings in the whole year. Individual fruit cultivars also appeared a fruit drop from August to September. The main causes of physiological fruit drop: First, incomplete flower bud differentiation, causing early fruit drop; Second, poor pollination, some varieties, especially in Japan most of the persimmon must be configured pollination tree, otherwise the fruit can not be developed, early fruit drop serious; It is due to the weather, the flowering period is continuous with rain, which affects the easy fruit-dropping during pollination. Fourth, the tree structure is unreasonable, and the ventilation and light transmission are poor, which results in the growth of the tree bar and is easy to drop fruit. The fifth is the lack of fertilizer and water, the soil is dry for a long time, the soil is poor, and the fertilizer is water. Difficult to absorb, resulting in fruit drop; Sixth, excessive soil moisture, root absorption capacity decline, even if the application of more fertilizer, the tree is difficult to absorb and use, due to insufficient nutrients supply and fruit drop.
Fruit drop due to pests and diseases
Shizillae is generally harmful to the fruit before and after the harvest. The first generation of damaged fruit is not easy to fall off and will be hung on the tree. The larvae will phlegm and continue the second generation of damage. The fruits of the second generation of victims are easily detached when the color changes from yellowish green to orange-red and softens and softens.
Anthracnose occurs in the late growth stage, and is generally caused by a large number of diseases in September, causing fruit drop.
Prevention measures
To prevent persimmon fruit drop, one is to configure the pollination tree (for the species that must be equipped with a pollination tree), and the other is to circumcribe the trunk or main branch of a strong tree at flowering time, and the width should not exceed 0.5 cm. After the ring cutting, the fertilizer and water supply will be strengthened; Appropriate pruning, especially to strengthen summer pruning, remove unwanted and redundant shoots, promote ventilation and light transmission; Fourth, prevent and treat pests and diseases, strengthen fertilizer and water management, and increase tree vigor; Fifth, spray spraying on alkaloids during flowering or young fruit 600 Double fluid; six is ​​topdressing once a year in autumn and spring.
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