Ulcer disease has become the major disease that restricts the development of the kiwifruit. Since the onset of the red yang variety, it has been infected with Hayward, Jinxiang, Xu Xiang and Qin Mei. People only noticed that the morbid performance of the spring was obviously prevented. In fact, prevention and treatment of ulcer disease must adopt a comprehensive approach to control. Several methods for the prevention and treatment of ulcer disease are introduced as follows:
First, the most obvious manifestation of symptoms is the beginning of red bleeding in the branches after the spring began to turn into a reddish-brown color, where to go where the infection, in serious cases when the whole disease, leading to tree death. There are performances on leaves and fruits, and it is not yet apparent in Shaanxi.
Second, the incidence of ulcer disease is a bacterial disease, infection in Shaanxi from August to September, but rarely hidden. Symptoms: The disease occurs at the temperature of 4-20°C in the second year of spring, and is most severe in March-April. It decreases with the increase of temperature in May. In the event of severe cold injury, ulcer disease is aggravated. In areas with high nitrogen fertilizer use, the branches and leaves are not strong and the incidence is severe. Severe areas of insect pests and excessive areas of pruning wounds are also severely affected by wound invasion and infection.
Third, the prevention and control methods 1. Completely control pests, reduce the wound infection caused by insect pests, such as Daqingyeye, use 70% of precious water dispersible granules 1000-1500 times liquid. 2. Reduce the wound. When cutting, it will reduce the size of the wound and cause the bacteria to invade. Big wounds must be coated with protection. 3. Pruning shears disinfection. Special attention must be paid to cutting the diseased tree and not to use the same cut-and-cut disease-free tree. To cut it first, use alcohol or fire; an orchard first cuts the disease-free tree, and then cuts the diseased tree. Two or more can be used. Disease tree, a cut disease-free tree. 4. Cultivate a robust tree to reduce the incidence of disease. For example, in Zhao Zhixiu Orchard, Xiahe Village, Zhouzhi County, there is no canker disease when the tree is strong, but there is a single plant in the surrounding orchard. 5. Grasp the key prevention and control time, starting in August, especially in September the bacteria invade, control from the source, you can use the bacteria poison clear 400 times liquid + foliar fertilizer if the Friends of the Amino Acid 600 times or use 25% Jin Lux EC 6000 times + leaf Fertilizer +72% agricultural streptomycin 3000 times spray. Spray twice, once every 15 days. 6. Spring onset. The red water was found to be scraped off. The diseased part was scraped first. When the diseased part was scraped into the good skin junction, the scraper was sterilized with alcohol or fire, and the skin was scraped again. After scraping, it was smeared with 50 times green copper, or with stone. Sulfur mixture stock solution +72% of streptomycin for agricultural use, the diseased skin scraped off must be picked up and concentrated to burn, and can not stay in the garden. 7. Strengthen quarantine in non-disease areas. Diseased seedlings and fruits must not enter the disease-free zone. Ulcer disease is an intractable disease, but with comprehensive prevention and control measures, it will be able to cure it. In the past few years, he was unable to control because he only treated the surface and did not exert his efforts on fundamental prevention and control.
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