1. Incidence conditions and factors: The optimum temperature for growth is 23°C-25°C, and it spreads rapidly when the relative humidity is 75%-85%. In the storage period, high temperature and humidity, poor ventilation, especially after the chilling damage of potato block serious. 2. Infection route: The disease exists in the air or adheres to the damaged potato stalks or overwintering in the storage pits and is invaded by wounds. The sporangial spores and cyst spores are produced in the diseased department and re-infested by airflow propagation. The potato pieces have wounds or are susceptible to freezing. 3. Control methods: (1) Try to use the new cellar when it is stored. Before using the old cellar, the old soil in the pit should be removed to expose new soil, and sulphur can be used for fumigation and disinfection. The amount of sulfur is 15 g/m3. (2) timely harvest to avoid mechanical damage. To collect before and after the frost fall to prevent freezing in the field, and should grasp the sunny harvest, in the collection, transport, storage process, to prevent damage and avoid producing wounds. (3) Select healthy potatoes, safe access to the pit. Before the sweet potato is put into the cellar, it must be carefully selected to eliminate diseases, insects, wounds, cold damage, and rotten potatoes, and the potato pieces must be sunned for 1-2 days to promote the healing of the potato pieces. After the water vapor is air-dried, it is put into the pit. (4) Strengthen the management in the pit. Sweet potato should be ventilated within 2-3 weeks after entering the pit to prevent excessive temperature and humidity inside the cellar. The cold period should be well-insulated and the cellar temperature should be maintained at 12°C-14°C. In the spring of the following year, the cellar temperature should be checked frequently, and the cellar temperature should be maintained at 10°C-14°C in time for venting or cellaring. It was found that the diseased potato was completely cleared and brought out of the pit. Fertilizer Spreader,Manure Fertilizer Spreader,Tractor Fertilizer Spreader,Pto Driven Fertilizer Spreader Taizhou Yingtian Agricultural Machinery Manufacturing Co., Ltd. , https://www.sakuradaagc.com
Anti sweet potato soft rot
The soft rot of sweet potato occurred in the storage period of sweet potato, which was mainly harmful to the potato. After the potato squash became infected, the diseased part became light brown and immersed in water. The diseased tissue was soft and rotted. After the skin was broken, yellow-brown juice flowed out and a musty odor was produced. The wine tasted slightly, and a large number of gray and white moldy layers grew on the surface of the diseased part. The small black spots, after the emergence of a large number of black moldy hair on the surface of the disease to contaminate the surrounding diseased potatoes, the disease spread rapidly, the whole root is a soft rot, giving off bad smell.