According to recent surveys of plant protection stations in major rice production areas in Heilongjiang Province, some rice seedlings in central and southern regions have begun to develop blue and rust. The rate of culprit in Tonghe River reaches more than 20%, the rate of diseased plants is 2%~3%, the rate of sheds in cenests is 1%, and the rate of diseased plants is 10%; the incidence rate of Fangzheng is 0.1%, and the rate of diseased plants is 0.3%; Wuchang Individual nursery beds in Tailai, Qing'an, and Beilin are also sporadic. In addition, the incidence of rice cotton rot is also more common than usual, and the individual seedbeds in the northern region also suffer from low temperature and cold damage. At present, most of the province's rice seedlings are in a leaf stage. They are about to enter the two-leaf to three-leaf period of susceptible diseases. The recent continuous low temperature and high humidity conditions in the shed will make the seedlings grow weaker and the disease resistance will decline. . As the weather improves in the future, if the temperature rapidly rises, the management of seedlings such as ventilation and seedlings by the farmers will not keep up, and the range of occurrence of rice seedling blight and blight will expand, and the degree of occurrence will further increase. To this end, the following suggestions are made: 1. Strengthen rice seedbed management. At the moment when key issues such as seedbed management and seedling diseases occur, all localities must properly ventilate their seedlings, especially to strengthen the management of small and medium-sized sheds. In case of low temperatures, nursery sheds should be covered with straw curtains, quilts, or covered with plastic film on the seedbeds, newspapers, etc. at night; excessive moisture in the seedbed can dig trenches around the seedbed to reduce the water table. The seedlings with severe incidence of bacterial wilt should be immediately irrigated on the water bed and subjected to string irrigation. The conditions should be sent as soon as possible. 2. Timely medication control. The bacterial seedlings that have suffered from blight have to be controlled in the early stage of the disease. It is recommended to use 30% hymexazol cream for water, 3000 times for water, 2~3 kg for each square meter, and wash the seedlings in time after spraying to prevent the burning of seedlings; 97% hymexazol powder, per square 1 gram of rice is watered; AA grade rice can be prevented by using 2% amino oligosacchine in advance, and 5 ml per square meter of water spray is added. The control of rice seedlings cotton rot, can be found in the center of diseased plants, in time with 25% metalaxyl WP 800 to 1000 times, or 1000 times the copper sulfate, even spraying. In addition, 15-25 kilograms of plant ash per acre, there is also a certain control effect. In addition, for rice seedbeds with physiological diseases and phytotoxicity, appropriate amounts of plant growth regulators such as brassinolide can be added when using the above-mentioned fungicides to improve the quality of seedlings and to alleviate diseases and phytotoxicity. SICHUAN UNIWELL BIOTECHNOLOGY CO.,LTD. , https://www.uniwellbio.com