How to control fine stripe disease of rice

Rice bacterial leaf streak is referred to as rice fine leaf streak, which is an important disease in rice production in China. The pathogen belongs to Monosporium flavum, which invades from the stomata of leaves, and the disease can occur in any growth period of rice. The disease spot is a short and thin narrow stripe, and the stripes appear between the leaf veins. according to the light observation, the disease spot is translucent, waterlogged, and turns red in the later stage, and there are a large number of bacteria on the spot, especially on the back of the leaf, it is not easy to fall off when dry. Because hybrid rice is still lack of disease-resistant combinations, and the disease occurs in a wide area and uneven distribution, which brings great difficulties to seed quarantine; high-yield and high-yield cultivation measures are more conducive to the occurrence of diseases, but chemical control does not have a good specific pesticide. At present, the main measures to control the disease are seed disinfection, seed quarantine, planting disease-resistant varieties and strengthening cultivation management, supplemented by a certain degree of chemical control. After years of experimental research, the Institute of Plant Protection of Guangdong Academy of Agricultural Sciences put forward the method of seed disinfection and pesticide application at seedling stage to prevent and cure the disease. After the implementation of this technology, good results have been obtained, and it can be used as an auxiliary measure for high and stable yield of rice. The specific methods are as follows:

The main results are as follows: 1. In the disease occurrence area, the seeds were disinfected with 500x solution of TC seed disinfectant, and BC sterilized Dan was sprayed twice at the seedling stage of 3Mel and 4 leaves.

2. When cultivating throwing seedlings, TC seed disinfectant 500x solution was used to disinfect seeds, and then BC sterilized Dan 600x solution was sprayed once at seedling 2-leaf stage.

3. In the seed propagation base of hybrid rice, TC seed disinfectant was used to disinfect seeds, BC was sprayed twice at seedling stage, and BC was sprayed once at the end of tillering stage. By using the above methods to control fine stripe disease, the primary infection source can be eliminated at the key points where the disease occurs, and the onset period of the disease can be delayed for 7 to 10 days, so that the most sensitive period of disease in the process of rice growth is staggered with the peak period of disease occurrence, and the control effect is as high as 80%. The loss caused by the disease is greatly reduced, and the yield loss of 8% can be recovered. Due to the use of drugs in the seed and seedling stage, the labor service cost and agricultural medicine cost can be greatly saved, and the prevention and control cost can be saved by 90%.