First, the symptoms and the incidence of the disease The disease mainly damage the leaves can also infect new shoots and fruits. After being damaged, the leaves become deformed and the color is red. The diseased leaves are thickened, become brittle, and finally brown and dry off. The new shoots were shortened between the victim's festivals and the leaves were born. In severe cases, the diseased tip twisted and died. The pathogenic spores overwintered on peach scales. When the buds of the peach tree sprout, the spores start to develop, and the germ tube penetrates the leaf epidermis or is immersed in the bud by the stomata. The pathogen is cold and humid. The optimum temperature for the germ development is 20°C, the minimum is 10°C, and the highest is 26°C. Second, control methods (1) Control the temperature in the peach when the germination to improve the greenhouse temperature, to avoid the hypothermia duration is too long, can effectively control the occurrence of the disease. (2) Remove diseased leaves and diseased shoots at the initial stage of disease, remove diseased leaves and diseased shoots in time, and burn them in a concentrated manner. (3) The chemical agent controls 3 to 5 Baume degree lime sulfur sprays during bud expansion to eradicate the source of overwintering bacteria. Sprouting and leaf spraying 50% sulfur suspension 200 to 400 times liquid can receive good control effect.
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