What are the control measures for rice bakanae disease?

Currently, the method used in production to control rice bakanae disease is seed soaking with chemicals. The main chemical varieties used include "901", Emiaoling, Yijinling, prochloraz, etc. Some fungicides have been used in our province for more than ten years. Long-term single use of one fungicide will cause the pathogen to develop resistance, thereby affecting the fungicidal effect. During seed soaking, it is generally also required to stir once or twice a day. On-site investigation shows that all these chemicals are available, but the specific operations differ, and the control effects among different chemicals also differ significantly.

Low temperature and non-standard seed treatment operations also have a relatively large impact on disease control effectiveness. When soaking seeds with chemicals, each fungicide has strict requirements for the concentration of the solution, the amount of seed soaked, the temperature, and the soaking time. The low temperature this spring had a certain impact on the effectiveness of the chemicals. Non-standard seed treatment operations by some rice farmers also led to unsatisfactory control effects on rice bakanae disease.

1. Diseased rice plants in seedbeds should be removed before transplanting. Before transplanting, it is best to drench the seedbed with a chemical solution (prochloraz 25% EC 2000-3000 times dilution). Diseased plants found in the main field should be removed promptly.

2. Seed treatment during seedling raising must be standardized. The seed-soaking chemicals used should be varieties with fewer years of use and good efficacy, such as prochloraz, etc. Different rice seed varieties should be soaked separately or packed in separate gauze bags.

3. For seed fields, try to select fields that are disease-free or lightly affected for seed production.