This disease, also known as sore disease, is the main disease of pear trees. It is widely distributed and has severe damage. It mainly damages leaves and fruits, and also invades shoots, shoots, and flowers. The disease often causes a large number of leaves and young fruit to fall off, or deform the fruit, which has a great impact on the growth, results and high yield and quality of pear trees.
[Hazardous Symptoms] When the leaves are on the path, they appear as yellowish spots that are nearly round or irregular on the back of the leaves. Soon, the lesions grow black moldy layer along the edges of the main and branch veins. When the damage is serious, many lesions comfirm each other. Zhang Yebei is covered with black mold layer, causing early defoliation. In the young fruit period, the growth is obstructed and the fruit is deformed or shed. When the fruit grows, it suffers damage. The lesion is sunken and swarthy. The crack is hard, the texture is hard, the bitter taste is bitter, and the disease is deformed and the quality is greatly reduced.
[Control methods] (1) Strengthen management of orchards and increase application of phosphorus and potassium fertilizers to increase tree vigor and increase disease resistance. The tree with severe disease should be properly recut, the tree canopy is too dense, and sparsely sheared to improve the ventilation and light transmission conditions. (2) Clear the onset center in mid-late April to reduce re-infection. (3) Prevention and control of spraying should be carried out during the critical period of the emergence period of central diseases, into the plum and middle of Meiyu. The agent can be used 50% carbendazim WP 1000 times, or 50% thiophanate WP 800 times, or 50% TF WP 500 times, in addition to 1:3:200 Bordeaux, Can receive good control effect. At the same time, it can be used interchangeably with other types of fungicides, such as 65% Duo Cao WP 1000 times, or 70% Dibute Aqueous 500-times, or 30% TFE 10000-fold etc. , can improve the control effect.
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