Pear scab is a common disease of pear trees. This disease is very harmful to pear trees. In recent years, it has affected the export of pear fruits in some places, causing no small losses. In recent days, there have been signs of severe occurrence of pear black spot disease. Experts recommend taking measures to prevent and treat it.
The symptoms of pear scabs are: after the treetops and petioles become infected, yellow-brown oblong lesions form at the base of the pears. Afterwards, the black mold layer gradually expands upwards. The diseased shoots and petioles are covered with mildew and finally die. When lesions appear on the shoots in summer, the ridges rise slightly, such as beans, and they are covered with moldy layers. Afterwards, the moldy layer gradually sag and crack, and the disease falls off the following year, leaving only one scar. When the leaves are invaded, round or irregular lesions occur along the branch veins in the back of the leaves. At the beginning, they are pale yellow and dark stains on the back. There are black molds on them, and the edges are star-shaped radiation. When the disease is serious, it can expand to the front of the blade. With the development of the disease, the diseased leaves gradually fall off in reddish brown. After the fruit became infected, a pale yellowish round lesion began to appear and a dark green layer of mildew gradually developed. The flesh of the diseased part hardened and gradually swelled and cracked as the fruit increased. When the disease is serious, the young fruit is deformed and it is easy to fall off early.
Pear black spot disease generally occurs in some places in early May and early June, and some arid regions have late onset. The most susceptible varieties are Yali pear, Ci pear, Qiubai pear, Baozhu pear, Haidong pear and so on, and the onset time is earliest. To prevent pear scab, a 1:2:200 Bordeaux mixture can be sprayed. In late June and late August, gypsum 4000-6000 times can be used to prevent the occurrence of pear scab.
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