The diagnosis and control of brown spot of red bayberry

Myrobalan brown spot is a fungal disease that damages the leaves and causes the flower buds and twigs to die, severely affecting tree vigor and yield. Incur 3-4 years after the onset of illness can cause the death of the whole plant. As far as the author is concerned, the disease is currently occurring in many varieties of bayberry in our city. It is necessary to draw the attention of the majority of Meinon farmers. Before and after May, the disease spread and spread during the rain and invaded the leaves. By August, the disease began to appear. In October, the number of lesions increased, followed by a large number of fallen leaves. Currently, it is a good time to observe the disease. When the disease condition appeared, needle-sized purple-red dots began to appear on the leaves, and gradually expanded to be nearly round or irregular, with a diameter of 4-8 mm. The center of the lesion is reddish-brown, brown or grayish brown on the edge, and the center of the lesion changed to light brown or grayish white, with scattered small black spots on it. Most of the lesions healed into larger plaques, causing the diseased leaves to dry off. The best prevention and treatment time of the disease is from mid-May to early July after harvest. For the time being, it is mainly to clean the leaves of orchards and burn them to reduce the source of overwintering, so as to lay the foundation for prevention and treatment in the coming year; The use of lime sulfur (water agent) can be assigned to 3-5 (Bomer) degree, and spray 2-3 times.

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