The appearance of "tubular flowering" in potato is actually a cancerous disease. From the name of potato cancer disease, we can know that this disease mainly damages the potato, does not harm other crops, and is less likely to endanger human health. The so-called cancer is caused by the fact that the pathogens continue to stimulate the host cells to divide, forming large and small tumors, and even larger surrounded by the base of the underground stem. Tuber suffers from cancerous lesions, which occur at the buds. The epidermis of the tumor is often cracked and loose, similar to cauliflower. The cancerous tissue is yellow-white in the early stage, dark brown in the late stage, soft, perishable, and produces malodour. The diseased potato can still continue to spread during the cellaring period, resulting in a rotten cellar. There were no obvious differences between the early stage and the healthy strains in the field disease strains. The diseased plants in the later stage were taller than the healthy plants, and the leaves were dark green, with many branches, and the flowers, stems, and leaves could produce abnormal lesions. The disease causing potato cancer is a low-grade fungus. The pathogens live through the resting sporangia in the diseased tissue or in the soil from the residue of the diseased body. The resting sporocysts are highly resistant to stress, and can survive in soil for two to three decades. When conditions are right, they produce zoospores and zygotes that invade the host epidermis cells and buds. In the growing season, germs continue to spread through sporangia and zoospore. Low temperature and humidity, cold climate, large temperature difference between day and night, high soil moisture, and temperature at 12°C～24°C, are favorable for pathogens to infect, so the disease currently occurs mainly in Sichuan and Yunnan, and the epidemic area is generally at an elevation of about 2000 meters. The cold mountain area. In addition, the soil is rich in acidity and organic matter, which is beneficial to the disease. As diseased seed potato is an important link in disease propagation and continuation, currently, the first measure to control potato cancer disease is to strictly quarantine seed potatoes, in particular to check whether there are tumors around the eyes. The diseased area was designated and the seed potatoes in the affected area were prohibited from being transported outwards, and a disease-free seed breeding base was established. The soil of the sick field and the plants growing on it are also strictly prohibited from moving out. Followed by the selection of disease-resistant varieties. Severe disease plots should be changed to non-solanum crops. In the general area, the diseased potato should be removed strictly before planting, net manure should be applied, and phosphorus and potassium fertilizer should be added. During the growing season, the diseased plants should be dug out in time to burn, and the diseased potato should be removed before entering the pit. In addition, the increase in lime, the acidity of the soil has a certain degree of disease prevention.
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Potato cancer disease was first discovered in Hungary in 1895 and has now become a dangerous disease in potato production in many countries in the world. It has been identified as a quarantine fungal disease in our country. This disease generally cuts production by 50% in the normal area, and reduces the quality of the tubers. In severe cases, the crops cannot be eaten unless the crop is harvested or the diseased potatoes are not rotten. 
How to prevent potato tuber blossom