(1) Agricultural control: After the fallen leaves of fruit trees in autumn and winter, clear the fallen leaves in the orchard in time, cut off the branches of pests and diseases, and burn or bury them centrally. Strengthening cultivation management, improving the disease resistance of trees and scientific and reasonable cultivation management measures are the fundamental to prevent and control apple ring rot. Nursery should be located far away from the disease area to cultivate disease-free seedlings; Choose disease-free seedlings when building the garden, plant logistics inspection, and eliminate the diseased seedlings in time when they are found; When pruning young trees, avoid using diseased branches as pillars, and do not pile the pruned diseased branches near the orchard; Strengthen the management of fertilizer and water, balance the application of nitrogen, phosphorus and potassium, and increase the application of organic fertilizer, ternary compound fertilizer and trace elements such as boron and calcium before and after flowering to meet the needs of fruit tree growth, make the tree grow in a balanced way and enhance the resistance of apple trees to pests and diseases; In the process of fruit tree growth, long branches, drooping branches, too dense branches, pest branches, pest fruits, etc. It should be cleared in time, and the reasonable load should be determined according to the age of the tree, so as to increase the ventilation and light transmission of the crown, thereby enhancing the tree potential and improving the ability of fruit trees to resist pests and diseases.
(2) Pesticide control: Rational use of drugs and mastery of the application period and times can effectively improve the disease control effect. Scrape off diseased tumors and old skins on the trunk before germination, and apply sulfur mixture or quicklime on the scraped trunk to eradicate latent bacteria or control the spread of diseased spots and protect branches. The available agents are carbendazim, propiconazole and pentanol (Fulian). Effective agents in the growth period include thiophanate-methyl, mancozeb, metsulfuron-methyl, mancozeb, tebuconazole, imidazole, flusilazole, captan, pyraclostrobin and azoxystrobin. The main medication period is about 10 days after flowering to July or mid-August. During this period, it is the key to chemical control to pay attention to "spraying after rain", and the spraying times of late-maturing varieties can be increased appropriately. In addition, it must be noted that different fungicides should be used alternately before and after harvest to avoid drug resistance and adaptability of pathogenic bacteria. In general orchards, a chemical control system with Bordeaux mixture as the main body and organic fungicides alternately used can be established. Bordeaux liquid has the characteristics of rain erosion resistance and good protective effect. However, it is forbidden to spray Bordeaux mixture in young fruit period (within 30 days after flowering) and late fruit growth period. It is suggested to use protective fungicides such as mancozeb alternately (spraying) or mix them with systemic fungicide such as thiophanate-methyl. In the rainy season, it is best to add additives such as poisoning, killing AIDS, and leveling nails to improve the adhesion of drugs. It should be noted that thiram arsenic is used in pollution-free fruit production.
(3) Bagging for disease prevention: Apples should be bagged after physiological fruit dropping or fruit thinning. Red Fuji, Red Star, New Jonah Gold and other mid-late maturing red varieties which are not easy to produce fruit rust are suitable for bagging in early June. Yellow-green varieties, such as Jin Shuai, began bagging about 10 day after flowering. Before bagging, the orchard should be sprayed with fungicides such as thiophanate-methyl 1 fold, and bagging can be carried out after the liquid medicine is dried. The consequence of bagging is that it grows in the bag and is protected by the fruit bag, which not only prevents fruit diseases such as ring rot, but also makes the fruit smooth and pollution-free. Prevention and control of leaf diseases should be strengthened after bagging. Generally, fruits are bagged in the coloring period (about 30 days before harvesting), and after bagging, it is necessary to decide whether and how many times to apply pesticides according to the occurrence of diseases on fruits. (4) Biological control: spraying Lvkangwei for 3-4 times during the whole growth period of apple can achieve good disease control effect. In the middle and late April, spraying began in the bud stage of apple to inhibit the source of bacteria; Spraying in the first half of May can reduce rotten fruit after falling flowers; Spraying in mid-June can promote the growth of young fruits and reduce the infection of germs on fruits; Spraying in mid-July can reduce the harm of germs to fruits and leaves. The application of bitter berberine fungicide to control trunk disease spots and young branch disease spots has a good control effect on apple ring rot. The compound biological agent composed of Trichoderma and Pseudomonas fluorescens can effectively inhibit the growth of apple ring rot fungus. The field experiment showed that the relative control effect of the compound preparation on apple ring rot could reach 84.2%. There is no significant difference between alternate spraying bordeaux mixture and chemical pesticides, which can increase the fresh weight of hundred fruits. Soaking fruit can reduce the occurrence of fruit decay during storage. (5) Prevention and cure during storage: After the fruit in the apple orchard begins to get sick, pay attention to removing the diseased fruit and burying it deeply. Fruits to be stored and transported should be strictly removed from diseased fruits and other damaged fruits. It should be stored at low temperature, and storage at 0 ~ 2℃ can control the occurrence of diseases. Storage at 5℃ is basically not pathogenic. Soaking healthy fruits in sec-butylamine for 3 minutes or Tekdo for 3 ~ 5 minutes, taking them out and drying them in the warehouse, or treating the fruits with sec-butylamine fumigant can effectively control the rotten fruits during storage. Many antagonistic bacteria such as Bacillus, Pseudomonas, small filamentous fungi such as Trichoderma harzianum and yeast have obvious inhibitory effects on apple ring rot during storage.