At present, the leaves of some orchards such as apples and big cherries have begun to shed leaves, which slightly affects the normal growth of fruit trees and is harmful to fruits and flower buds. If defoliation is serious, there will be a phenomenon of secondary flowering and early germination in the same year, which will lead to no yield in the coming year and no safe wintering in winter, and the development of fruit industry will be greatly affected. In order to prevent the defoliation from aggravating and warn other orchards of defoliation, the related knowledge is introduced:

Causes of defoliation of fruit trees

Leaf diseases, such as brown spot, gray spot and ring spot, can cause deciduous leaves; Pests such as red spider and liriomyza sativae will also cause defoliation if they are not controlled in time; This year, the hot and dry weather lasts for a long time, and improper watering will cause root problems and defoliation, especially cleaning the orchard. In some areas, there are frequent rainstorms and improper drainage after the rain, especially in orchards with poor soil quality and easy waterlogging. Because of root retting, root rot and other problems, leaves will fall and even trees will die.

Solution of deciduous fruit trees

We should treat them differently for different reasons.

Fallen leaves caused by leaf diseases: First, use 2500 times azoxystrobin (or tebuconazole, difenoconazole, etc.) as quick-acting Xinqiao Run (pyraclostrobin). ), and then spray 1:2:200 times bordeaux mixture for protection in a week or so. Orchards with pests such as red spider and leaf miner should be added with acaricide (3000 times) and 3.2% permethrin (1500 times). When spraying, add 300 times of high-quality foliar fertilizer such as Demei organophosphorus potassium to protect the leaves and restore their functions.

Orchards with fallen leaves due to high temperature and drought should be watered in time, especially sandy soil. The interval between watering should be shortened, and small water should be used frequently. If there are covering conditions, the fruit trees should be covered with cloth or weeds. Drainage should be done in time after the rainstorm, and ditches should be dug for drainage in orchards with waterlogging. Orchard waterlogging due to high temperature, drought or rainstorm should be irrigated with two-liquid method in time to restore root absorption function and preserve leaves. Orchards with grass on the ground should cherish grass, which is the bodyguard of fruit trees.