Measures for controlling Bad Seedling Disease of Rice

At present, seed soaking is the method to control rice evil seedling disease in production, and the main varieties of fungicides used are "901", Ximiaoling, Yiziling, prochloraz and so on. Some fungicides have been used in our province for more than ten years, long-term use of a single fungicide will cause pathogens to produce drug resistance, thus affecting the germicidal efficacy. When soaking the seeds, it is generally required to stir once or twice a day. There are all these kinds of pesticides in the field investigation, but there are differences in specific operation, and there are also significant differences in control effects among different agents.

Low temperature and non-standard seed treatment also have great influence on the effect of disease control. When soaking seeds, each fungicide has strict requirements on the concentration of solution, the amount of seed soaking, the temperature and the time of soaking seeds. The low temperature this spring has a certain effect on the efficacy of the drug. The non-standard seed treatment operation of some rice farmers also led to the poor control effect of rice evil seedling disease.

The main results are as follows: 1. The diseased rice plants in the seedling bed should be removed before transplanting, and it is best to pour the seedling bed with chemical solution before transplanting (25%EC2000-3000 double solution of prochloraz). Honda should remove the diseased plant in time when it is found.

2. When raising seedlings, the seed treatment should be standardized, and the seed soaking agents should be selected, such as Mixianan, etc., and the rice seeds of different varieties should be soaked separately or packed in yarn bags.

3. Seed fields with no disease or light disease should be selected as far as possible to keep seeds.