Peach bacterial perforation is a disease with a wide distribution and high incidence. Bacterial perforation disease occurs in all peach production areas in the country, especially in the coastal areas, along the lake areas and poorly drained orchards, and in rainy years, often occurs severely. If control is not timely, it will easily cause a large number of fallen leaves and reduce nutrient accumulation. Affects the formation of flower buds. Not only weakened tree vigor, but also reduced production in the year, and it will affect the results of the second year, resulting in a poor harvest. In addition to harming peach trees, this disease can also invade many kinds of stone fruit trees such as plum, apricot and cherry. First, the harm of symptoms mainly damage the leaves, but also can damage the branches. At the beginning of the onset of the disease, water-stained green dots appear, which expand into round or irregular lesions, appearing purple-brown to dark brown. The lesions are of different sizes, generally about 2 to 3 mm, and the lesions are water-stained. There is also a yellow-green halo ring. After the lesions have dried out, a circle of cracks are formed at the junction between the diseased part and the healthy part, and perforations are formed after shedding, or parts are connected with the leaves. After the branches are damaged, there are two different lesions, one called spring ulcer and the other summer ulcer. Spring ulcers occurred on shoots that were born in the summer of the previous year (the bacteria had invaded the previous year). When the first new leaves emerge in the spring, dark brownish herpes are formed on the branches, with a diameter of about 2 mm, and afterwards, the extension is as long as 1 to 10 cm, and the width is not more than half of the diameter of the shoots, sometimes causing the phenomenon of shrubbery. At the end of spring (before and after flowering), the epidermis of the lesions ruptured, germs oozing out and spreading. Summer ulcers occur more than in late summer, and on the shoots of that year, the lenticels act as the center, forming water-stained dark purple spots. Later, the lesions turned brown to dark brown, round or oval, slightly concave, and the edges were water-stained. The lesions of summer ulcers are not easy to spread and will dry quickly, so the spread is not significant. Second, the cycle of infection and disease conditions The pathogenic bacteria of the disease in the branches of diseased organizations overwintering, mainly in the spring ulcer lesions overwintering. In the spring of the following year, the bacteria lurking in the tissues with temperature rise began to move. Before and after the peach blossom, the germs leaked from the diseased tissue and spread through wind and rain or insects, invading through the stomata of the leaves and the lenticels of the branches. In the northern region, onset in May, severe onset in the first half of June, and during the summer drought, the disease progressed slowly and became severe during the rainy season. The incubation period for pathogenic bacteria varies according to the temperature and the tree vigor. When the temperature is 25°C to 26°C, the incubation period is 45 days, 20°C is 9 days, and 19°C is 16 days. The incubation period can last as long as 40 days. Warm and frequent rain or foggy seasons are suitable for disease. The orchards with weak tree deficiencies or drainage, poor ventilation, and partial nitrogen fertilizer are all more serious. The varieties are different, and the degree of disease is also the same. 3. The prevention and control methods advocate the principle of “prevention as the main, comprehensive prevention and controlâ€. According to the principle of “treat early, treat small, and treat the diseaseâ€, the following points must be achieved: 1. Strengthen orchard management: pruning in winter to remove diseased branches Thoroughly clean up dead branches, fallen leaves, fallen fruits, and weeds, and burn them together to eliminate the sources of overwintering. Pay attention to the drainage of the orchard and prune it properly so that the orchard will have good ventilation and lightness, and reduce the humidity in the orchard. Increase the use of organic fertilizers to avoid partial application of nitrogen fertilizers to make fruit trees grow healthily and increase disease resistance. 2. Chemical control: Peach is sprayed with 3 to 5 degrees lime sulfur before germination. From the end of May to the end of June, spray 65% ​​wettable agent zinc 300 to 500 times once or twice. Zinc sulphate lime solution also has a good control effect. The formula is 1 kg of zinc sulfate, 3 to 4 kg of lime, and 150 to 200 kg of water. 3, to avoid mixed with stone fruit trees: In the construction of Taoyuan, not only the pure tree species, select disease-resistant varieties, and do not plant nearby Li, apricot, cherry and other stone fruit trees.