What to Do About Persimmon Flower and Fruit Drop? The Latest Control Methods
When planting persimmons, because they are extremely demanding about their growing environment, improper management can very easily lead to flower and fruit drop, which seriously affects persimmon yields. So what should be done about persimmon flower and fruit drop? Follow along with the editor to see the detailed introduction.
1. Reasonable Fertilization
When topdressing persimmons, it should not be done too early. Generally, topdressing is done in May during the branch tip withering stage and in July during the fruit enlargement stage. Topdressing during these two periods can improve the fruit-setting rate of persimmon trees and has an obvious yield-increasing effect. In addition, it can also promote the number of flower bud differentiations for the next year and, through flower bud quality, effectively prevent flower and fruit drop.
2. Girdling During the Flowering Stage
Girdling during the flowering stage can both improve the fruit-setting rate and effectively prevent flower and fruit drop. The specific method is: in the early flowering stage of the persimmon plant, use a knife to cut two rings on the trunk at 30-50cm from the ground, about 0.5 cm apart vertically, with the depth reaching the xylem, and peel off the bark inside the rings. This completes the girdling. To prevent pathogens from invading the plant through the wound and causing harm, after girdling the wound should be properly treated, and it is best to bind the wound with plastic sheeting. In addition, it should be noted that weak trees and weak branches are not suitable for girdling.
3. Flower and Fruit Thinning
One of the reasons for flower and fruit drop is that too many flowers and fruits are set, and the nutrients needed for their growth exceed the plant's supply, so they drop due to insufficient nutrients, affecting the quality of the other fruits. Therefore, buds should be removed, tips pinched, and flowers and fruits thinned in a timely manner. Specifically: promptly remove overly dense sprouting branches and buds, promptly pinch off water sprouts that have grown to more than 20 cm, and promptly thin some of the plants or branches with too many flowers and fruits. This can reduce the plant's burden, concentrate more nutrients in some of the fruits, and promote their growth.
4. Strengthen Pest and Disease Control
A large part of the reason for flower and fruit drop is caused by damage from pests and diseases. For example, persimmon circular leaf spot, persimmon fruit borer, and persimmon mealybug can cause flower and fruit drop. Their control should be strengthened. Spray lime sulfur mixture at one Baume degree once in May each year, and spray Bordeaux mixture once in June. The control effect on them is relatively good.
5. Spraying Chemicals
Spraying a mixed aqueous solution of low-concentration boric acid and ammonium molybdate once during the full flowering stage has an obvious effect of increasing the fruit-setting rate and reducing the probability of flower drop. During the young fruit stage, gibberellin solution can be sprayed, which has an obvious effect of reducing fruit drop.
The above is an introduction to what to do about persimmon flower and fruit drop. We hope it can help you. To learn more related knowledge, please stay tuned to us.