Infection of peach scab. At the beginning, the infected fruits appeared green water-soaked and round spots with the size of 0.5-1mm. After the lesion expanded to 2-3 mm, it was dark green and partially fused together. The skin around the wound is still green. The lesion is confined to the pericarp and does not go deep into the pulp. In the later stage, the diseased spots were connected by cork, resulting in cracks. Disease spots often appear on the sunny side of the fruit, especially on the shoulders of the fruit. The diseased shoots are slightly round or shapeless lesions, which are dark green at first and then light brown. When pruning in winter, the disease tip should be completely cut off to eliminate the source of the disease on the tree, so as to reduce the chance of infection during the growth of peach trees. Improve the ventilation and light transmission conditions of Taoyuan, choose suitable tree shape and honey degree, and improve the wind and light conditions in the garden. Before the peach trees germinate, spray a pesticide with eradication effect, such as magnesium-sulfur mixture for 3-5 waves. During the growth period, triazole drugs were sprayed every 65,438+00 days from flower setting to the end of July, and diluted according to the instructions, and various triazole drugs were used alternately.