Journal of Agriculture and Food Science

Objective This study aimed to clarify the control effect of different seed treatment methods on rice bakanae disease (RBD), so as to provide a scientific basis for the efficient control of RBD. Methods Five representative fungicides for RBD were selected, and nine seed treatment methods were set up, including conventional seed soaking, sealed seed soaking, dry seed coating, and post-germination coating. After seed treatment, the seedlings were cultivated for 25 days using rice seedlings cultivation. Seedling quality such as seedling height, stem base width, root length, root number, above-ground fresh weight, and number of diseased plants were determined, and the control effect of RBD was calculated. Results Compared with the control, the different seed treatment methods of the five fungicides had no significant effect on rice germination rate and emergence rate. In general, the control effect of seed coating treatment on RBD was significantly better than that of seed soaking treatment, and it had a dwarfing and strengthening regulatory effect on rice seedlings, but this effect varied with the type of fungicide. For the same fungicide, the dry-seed direct seeding with seed coating showed the best control effect on RBD, followed by the post-germination coating and the seed soaking treatment with dry seed coating. There was no significant difference in the control effect of RBD between conventional seed soaking and sealed seed soaking treatments for the same fungicide. Conclusion In production practice, it is recommended to use 11% fluxapyroxad·fludioxonil·metalaxyl-M suspension seed coating agent or 6.25% metalaxyl-M·fludioxonil suspension seed coating agent for seed coating treatment, and 4.23% ipconazole·metalaxyl microemulsion for seed soaking treatment to achieve efficient control of RBD. For the factory seedling raising scenario, it is suggested to give priority to the dry-seed direct seeding method coated with 11% fluxapyroxad·fludioxonil·metalaxyl-M suspension seed coating agent.

Rice bakanae disease; Seed treatment with fungicides; Seed coating with fungicides; Control efficacy