Apple ringworm disease is a major disease that occurs in China and is a major disease that occurs year after year. In recent years, with the in-depth study of apple ringworm disease, many new research results have been produced. Among them, some research results are significantly different from our previous understanding of ringworm disease. Therefore, it is necessary to re-recognize this disease in order to prevent it more effectively. First, apple ringworm disease and its pathogens in the past for apple ringworm disease and its pathogens are: 1 apple ringworm disease, also known as rough skin disease, rotenus rotten disease. The symptoms of nodules and rough skin can be caused on the branches of the apple, and brownish lentigial lesions are caused on the apple fruit, resulting in rotten fruit. 2 Pathogen of apple ringworm disease: Botryosphaeria bengengeriana f. sp.piricola (Specialized type of Pyracharium spp.). 3 Apple ringworm disease is considered to be two different diseases due to the dry rot that causes trunk rot in the branch of apple. However, the latest research results show that the pathogen of apple ring rot disease is Botryosphaeria dothidea, which is the same as the pathogen of apple dry rot. The apple ring rot and apple dry rot are the same disease caused by the same pathogen; Apple stems The symptoms of nodules and rough skin and ulcers on branches and dry rot are the different manifestations of the same disease under different conditions. Second, the distribution of apple ringworm disease in the world. Previous literature records show that: apple ringworm disease occurs only in apple production areas in Northeast Asia, namely Japan, South Korea and China. No record of this disease has occurred in Europe, the United States and Australia. Based on this, the European Union listed the pathogen of apple ringworm disease as a quarantine subject and restricted the entry of apples carrying this pathogen. However, the latest research results have proved that the pathogen of apple ring rot disease is the same as that reported in Europe and the United States. The cause of apple white rot disease from the United States can also cause apple ringworm disease on apple branches. The symptoms - nodular structure, therefore, apple white rot and apple ringworm disease are the same type of disease. Therefore, the distribution of apple ringworm disease is not limited to Japan, Korea, and China in Northeast Asia. It occurs in apple production regions such as the United States, South Africa, Australia, Brazil, and Argentina. It is just another name, apple white rot. In summary, the new findings not only corrected the pathogen of apple ringworm disease, but also defined the relationship between apple ringworm disease and apple dry rot and apple white rot. Therefore, apple ringworm should be Apple dry rot combines the research and prevention and treatment of a disease, which not only saves the research and prevention of apple disease, but also helps to formulate a more scientific and effective prevention and control strategy.
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