In early April of this year, the temperature in Heilongjiang Province was generally high, and the nursery period of rice was about 7 to 10 days earlier than usual. It has now entered a critical period of seedbed management. Affected by the recent continuous low temperature and rainy weather, rice seedlings in most regions show slow growth and poor root development. In addition, the seedbeds in some areas also suffer from low-temperature chilling injury, which is beneficial to the occurrence of rice blue and blight. According to surveys of plant protection stations and stations at major rice production areas throughout the province from April 28 to 30, rice seedlings in some areas have begun to develop blue and blight.
At present, most of the rice seedlings in our province are around the time of two-leaf and one-heartedness of susceptible diseases. In addition, the quality of seedlings is generally poor, there are more rainy weather, and the temperature fluctuates. If the seedbed is not properly managed, it may easily cause the seedlings of young rice plants. Blight, especially the occurrence of bacterial wilt. To this end, all localities must attach great importance to the investigation, monitoring, and prevention of blue seedlings and blight, so as to ensure that this year's rice cultivation in our province will provide good seedlings, seedlings and seedlings, and lay a foundation for the harvest of high yields of rice throughout the year. Specifically propose the following recommendations:
Seriously do a good job investigation and monitoring. All localities must immediately organize professional and technical personnel, go deep into the fields, investigate and monitor the occurrence of diseases, pay close attention to changes in the weather, accurately grasp the dynamics of the disease, and promptly guide farmers to prevent and control the disease.
Strengthen rice seedbed management. At the moment when the seedbed management and the critical period of blight and blight occur, all localities must instruct the farmers to do a good job of ventilation, especially the management of small and medium sheds. In case of low temperature, cover straw, quilts or cover membranes, newspapers, etc. around the shed at night. The severely diseased seedlings should be immediately irrigated on the waterbed and subjected to string irrigation. If conditions permit, they should be mailed or transplanted as soon as possible.
Timely use of drugs to prevent blight. 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, spray 2~3 kg per square meter; 97% hymexazol powder, 1 g/m2 for water irrigation; 35% for dry and dry spirit 10 grams of wet powder, 30 to 45 square meters of water after the watering seedbed; 50% of the dry and wet powder, 1 to 1.5 grams per square meter of water irrigation; AA grade rice available 2% amino oligosaccharide water, per square meter Add 5 ml of appropriate water bed spray. In some regions, there is still a habit of using dexamethasone to control bacterial blight, because the roots of the diseased seedlings are not well developed, and the enemy has inhibitory effects on the root system and is prone to phytotoxicity and should be avoided.
In addition, for rice seedbeds with physiological disease and phytotoxicity, when the above-mentioned fungicides are used, appropriate amounts of plant growth regulators such as small leaf enemy and tianfengsu and safe and reliable foliar fertilizers can be added to improve seedling quality and alleviate physiological diseases. And phytotoxicity.
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