How to prevent and cure citrus gum disease?

What is citrus gum disease? How to prevent and cure citrus gum disease? Also ask netizens with citrus planting experience to help introduce citrus gum disease, also known as resin disease, is a fungal disease, once the occurrence of prevention and control is very difficult. The causes of gum disease are: overdense planting, poor ventilation and light transmission, heavy soil viscosity, poor drainage, excessive application of nitrogen fertilizer, unreasonable intercropping, small space between crops and citrus trees, and serious disease in high temperature and rainy season. In addition, external transfer of diseased seedlings and scions is also one of the reasons for the occurrence of the disease. Therefore, the farming network has sorted out the prevention and control methods of citrus gum disease, which are listed in detail below for netizens' reference. Citrus gum disease control methods: method 1, citrus as much as possible bio-organic fertilizer, less nitrogen fertilizer (urea), more phosphorus and potassium fertilizer. Method 2. If there are stagnant water areas in citrus orchards, deep trenches should be opened in time for drainage. Method 3. Fruit trees with citrus gum are found, that is, the rough skin of the diseased part is scraped off first, and then several cracks are cut longitudinally to reach the xylem, and then Bordeaux solution + topzine + "tree protection general" is applied to sterilize and disinfect, so that the disease spot falls off quickly and the wound heals. Method 4, such as serious citrus gum disease should be controlled by smear irrigation method, can be used Bordeaux essence 1000 times or self-equipped 0.6% Bordeaux liquid irrigation roots, the amount of water depends on the age of the tree: the big tree is 1 barrel and the small tree is halved. Method 5. Foliar medication can be used to control citrus gum disease. Foliar medication is the main prevention, and it is best to use it before the disease occurs. Agents are: aluminum triethyl phosphate, metalaxyl manganese zinc deciduous fruit: "new high fat film" + insecticide + fungicide spray, continuous use for 3 times can get better results. Methods 6. Taking measures to protect citrus trees from cold in winter, such as brushing the trunk, cultivating soil in winter, and applying organic fertilizer once after citrus harvest can keep warm and prevent cold. Combined with pruning, remove disease and insect branches, withered branches and long branches, so that orange trees are well ventilated and transparent, and the disease is reduced. After pruning, smear "callus anticorrosive film" in time to seal the wound and make the trimming mouth heal healthily. Symptoms of lack of fertilizer in citrus prevention and control of anthracnose in citrus seedlings