Green onion continuous overcast and rain to prevent rust

High temperature and rainy season in summer and autumn, in case of continuous overcast and rainy weather, green onions are easy to get rust, farmers should take effective measures in time to strengthen prevention and control. Timely medication for prevention and control in summer and autumn, especially after 2-3 days of continuous rain, the occurrence of green onion rust should be checked in time. If brown and green spots are found on onion leaves, the medicine should be administered immediately. 3000 times triadimefon EC is generally available. Add 1/4 washing powder, spray fine spray, after the first application, control again every 7-10 days, in order to improve the disease prevention effect. In addition to doing a good job in field management such as drought resistance and waterlogging reduction, ammonium bicarbonate can be applied 15-20 kg per mu of land during the disease-prone period in summer and autumn to promote the growth of Welsh onions and resist diseases. Before transplanting, apply sufficient basic fertilizer per mu of onion field can apply 3000 kg of rotten pig manure, 45% of nitrogen, phosphorus and potassium compound fertilizer 25 kg, and after turning the rake evenly, then transplant young onions. Reasonable crop rotation in the same field, do not plant green onions, generally should be changed once a year. If there is a lack of rotation conditions, you should not continue to plant green onions next year after the occurrence of rust.