Prevention and treatment of citrus canker
Ulcer disease is a bacterial disease caused by Xanthomonas, which is particularly serious in orange trees, seedlings and saplings. The lesions are most serious when they occur on the surface of the peel, which directly reduces the quality of the fruit and affects the yield. Whether citrus can seize the market is of great significance for the prevention and treatment of citrus canker. The Chinese Pesticide Network Xiaobian has mastered some effective measures to prevent and cure citrus canker disease for your reference. 7+Person Hot Tub 7+ Person Hot Tub,large outdoor spa,outdoor living pool spa,spa with outdoor heated pool,modern outdoor hot tub Guangzhou Aijingsi Sanitary Products Co.,Ltd , https://www.inspirationhottub.com
First, the identification of ulcer disease can recognize ulcer disease, is the key to prevention and treatment; correct diagnosis, timely selection of drugs to kill, can achieve twice the result with half the effort. First of all, we must understand that ulcer disease is a bacterial disease, and it is a phytosanitary object with certain dissemination.
1. Recognize the pathology: the leaves are damaged, and there are yellow or dark yellow-green needle-like oil-like spots on the back of the leaves. Later, they gradually expand into near-circular, gray-brown lesions, and the front and back sides are raised, and the lesions are edged. Plugging, central depression cracking, such as crater-like, and has a fine wheel pattern, surrounded by yellow or yellow halo, most of the disease begins with orange trees.
2, master the law of incidence: pathogens lurk in the diseased tissue overwintering, especially the disease spots on the autumn shoots as the main wintering place (extracted diseased leaves). In the spring of the next year, under suitable conditions (20-30 °C), the diseased part overflows the pus, and spreads to the young shoots, young leaves and young fruits by the contact of wind and rain, insects and branches, and invades the young through the pores, pores and wounds. The organization, after nearly one month of incubation, is onset. The disease is conducive to the reproduction and spread of the bacteria in the hot and rainy season. Each citrus has a morbidity at each shoot, with the heaviest incidence of summer shoots, followed by the autumn shoots. Therefore, the main period of prevention and control is in the summer shoots, paying attention to comprehensive prevention and treatment of autumn canker ulcers. Orange trees are the most susceptible to disease, followed by oranges, and oranges are more resistant to disease. Therefore, in the selection of species, the disease should be selected according to the situation of the diseased environment. According to the path of disease infection, the factors that can cause wounds, such as the impact of typhoons, as well as the citrus orchards that are harmful to the leaf miner and the swallowtail butterfly, are serious; the pesticide network reminds: prevention and treatment should pay attention to the drugs after the typhoon and during the peak of the pest occurrence. treatment.
Second, prevention and control measures 1, seedling quarantine: seedlings and scions imported from the field, can be used 800 times liquid or 700 units / ml agricultural streptomycin plus 1% alcohol immersion 30-60 minutes; or with 3% sulfuric acid Ferrous immersion for 10 minutes. It is strictly forbidden to transfer seedlings, scions and fruits from the ward. If the diseased plants are found, they should be burned immediately.
2, from the management to improve the disease resistance of fruit trees: the application of base fertilizer, organic fertilizer based on peanut bran, increase the application of phosphorus and potassium fertilizer. Topdressing method: re-apply spring fertilizer, control summer fertilizer, moderate amount of autumn fertilizer, and enhance tree potential. At the peak of the onset, the summer shoots and autumn shoots were sprayed three times from the tipping stage to prevent the invasion of the leaf miner and the invasion of the ulcer disease.
3. Complete clearing of the garden in winter, reduce the source of the disease: combine the clearing and pruning twice in the winter and early spring, cut off the pests, branches, and branches, and burn the plants in the clearing.
4, pesticide treatment: master the period of medication is the key to prevention. First of all, we must recognize the most probable period of onset of infection - young shoots. Therefore, to prevent ulcer disease, we must keep new shoots. In the beginning of the new shoots to the new shoots and old crops must be sprayed more than three times (in combination with the control of the leaf miner). That is, the first shot is sprayed when the new shoot grows a grain of rice, and then sprayed once a week. This can have a multiplier effect. The fruit trees are mainly preserved, and they are sprayed once every 10 days, 32 days, and 55 days after Xiehua. The preventive drugs can be selected: 6000 units/ml of agricultural streptomycin plus 1% alcohol, 77% can kill 300 times of wettable powder, 400 times of copper oxychloride suspension and so on. The treatment of the drug can be selected: Kejiite 700 times solution, the prevention rate is up to 90%.