High incidence of pear black spot disease in summer How to control pear black spot disease

Scab of Yali pear is also called scab. In summer, high temperature and humidity are beneficial to the occurrence of pear scab. The pathogen of pear scab spread and infected in pear orchard by Rain Water, which mainly harmed leaves and fruits. After the leaves are infected, round, oval or irregular disease spots are produced on the back of the leaves, which expand along the veins of the leaves, producing radiant black mildew, and in severe cases, the whole back of the leaves is covered with black mold, causing early defoliation. After the fruit is infected, there are some round disease spots of different sizes on the fruit surface. after the disease spot is hardened, the surface is rough, sunken and cracked, showing a scab shape. the wound of the disease part of Rain Water is easy to be infected by mold and rot.

Scab of Yali pear

Second, prevention and control methods:

1. Agricultural prevention and control: diseased leaves and pears are removed in time, burned or buried deeply to prevent the spread and spread of bacteria. Remove stagnant water in time after rain to reduce the humidity in the orchard. Combined with summer shearing, erect branches, overgrown branches and cross branches should be cut off from the base in time to increase the ventilation and light transmittance in the orchard and improve the orchard microclimate.

2. Chemical prevention and control: timely spraying prevention before rain, timely spraying prevention after rain, and timely supplementary spraying after spraying. You can choose 40% DuPont Fuxing 10,000 times solution, 10% difenoconazole 3000 times solution, 80% Hanbang carbendazim 2000 times solution, which can kill 32 000 times liquid, spray once every 7-10 days, 3-4 times in succession. The above fungicides should be used alternately to avoid drug resistance. When spraying, you should pay attention to spray evenly, turn up and down the buckle, break through inside and outside, circle around the tree, hit the tip, touch the medicine up and down the crown, inside and outside the tree, and pay special attention to spraying the back of the leaves of Yali pear tree. In addition, the addition of foliar fertilizer can enhance the disease resistance of leaves.