What is the reason for persimmon fruit drop?

Persimmon is a large tree native to the Yangtze River Basin in China, and it is a fruit tree cultivated for a long time in China. But persimmon fruit drop will seriously affect the yield, so what is the reason for this? How to prevent and cure it?

What is the reason why persimmon trees fall fruit?

There are many reasons for persimmon fruit drop, such as incomplete flower bud differentiation, poor pollination, weather, unreasonable tree structure, insufficient fertilizer and water, excessive soil moisture, etc. Or fruit drop caused by diseases and insect pests such as persimmon stalk worm, anthracnose and so on.

How to prevent persimmon trees from falling fruit?

If you want to prevent and control persimmon fruit drop, you should do the following:

1. Flowering ring peeling ring

Peeling can be carried out at any time from early flowering to full flowering, and girdling is suitable for strong trees, strong branches or large fruiting branches. The width of the ring peeling caliber is 0.3 mm and 0.5 mm. After peeling, the peel is wrapped with plastic sheet to maintain the humidity of the peel and promote healing.

two。 Reasonable summer scissors

Remove dense and ineffective branches during the growing period, leave more branches on the windward side and less on the leeward side, so as to promote ventilation and light transmission. After pruning persimmon trees, hidden buds will sprout in large quantities. In order to reduce nutrition consumption, useless sprouts should be erased before Lignification. Long branches with room for growth, especially overgrown branches, are coring when they are 40 cm long.

3. Thinning of buds

When 2-4 fruiting branches were extracted from the fruiting mother branch, three flower buds in the middle of the first two fruiting mother branches were retained, and all the flower buds on the other fruiting branches were removed and reserved as preparatory shoots. When the fruiting mother branch produced more than 5 fruiting branches, the first three fruiting branches should be retained, with 3 flowers in the middle of each fruiting mother branch and all the others sparse.

4. Skillfully apply fertilizer and water

For big trees entering the peak fruiting period, it is necessary to strengthen fertilizer and water management, apply base fertilizer early in spring and full base fertilizer in autumn, but topdressing should not be premature. Generally, topdressing in the withered top of branches in May and fruit expansion in July can increase the fruit setting rate. Increase the number of flower buds next year and improve the quality of flower buds. Water should be watered in dry weather.

5. Chemical regulation

Spraying 500 mg / kg gibberellin plus 1% urea at full flowering stage and young fruit stage can improve the nutritional status of flowers and fruits, prevent the delamination of persimmon stalks and stalks, enhance the nutrient absorption function of flowers and young fruits, stimulate ovary expansion, and increase fruit setting rate. During the period of rapid expansion of fruit, foliar spraying 0-3%-0.5% urea solution and ammonium molybdate and other trace element fertilizer can reduce flower and fruit drop.

6. Prevention and control of diseases and pests

During the growing period, diseased fruits and worms were removed manually. In mid-June, a spray of 500 Bordeaux solution, or 65% Dysen zinc wettable powder 500 times, or 2.5% green kungfu 1500 times solution plus 1.5% chloramphenicol 800 times solution could control persimmon anthracnose, corner spot pain and round spot disease. During the peak of larvae in mid-late May, late July to early August, 2500 times of methamphetamine EC was sprayed mainly on the fruits, stalks and buds of persimmon trees, once every 10 days for 3 times.

Therefore, if you want to effectively control persimmon fruit drop, it is best to "prescribe the right medicine" according to the situation.