Pear pear scab, also known as scab, is the main disease of pear trees. In the summer, high temperature and high humidity are conducive to the occurrence of pear black spot disease. The pathogenic bacteria of pear scab strain spread in the pear orchard through rain, which mainly damages the leaves and fruits. After the leaves become infected, round, oval or irregular lesions are formed on the back of the leaves. The lesions spread along the veins and produce radiant black mould. In severe cases, the back of the entire leaf is covered with black mold and causes early defoliation. After the fruit is affected, some round lesions of varying sizes are produced on the surface of the fruit. After the lesions have hardened, the surface is rough, and the surface of the lesion is cracked and scabbed. The diseased wound is easily rotted by fungal infection when it is exposed to rain.
Control methods
1. Agricultural control. The diseased leaves and diseased fruits were found to be removed in time and burned or buried in a concentrated manner to prevent the spread and spread of germs. Immediately after the rain, remove the accumulated water, eradicate the weeds in the orchard, and reduce the humidity in the orchard. In combination with Xiajian, the erect branches, legged branches and cross branches are cut off from the base in time to increase the ventilation and light transmission in the orchard and improve the microclimate of the orchard.
2. Chemical control. Spray precautions immediately before the rain, timely spraying after the rain prevention and treatment, and timely spraying after spraying. The drug can be used 40% DuPont Fuxing 10,000 times, 10% difenoconazole 3000 times, 80% Hanban carbendazim 2000 times, can kill 2000 times of phlegm, spray every 7-10 days 1 time, even spray 3-4 times. The above fungicides should be used alternately to avoid drug resistance. Spraying should pay attention to uniform spray, the crown up and down, tree shrews inside and outside, must be drug, pay special attention to the back of the blade to spray medicine.
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