Abstract:

To clarify the control effect of thiofuramide seed treatment on rice sheath blight and its impact on rice growth, and provide a basis for its popularization and application, 24% thiofuramide SC was used as the experimental material, and three seed treatment methods, including seed soaking, wet mixing and dry mixing were conducted, and each method was set with five treatments of 150, 300, 450, 600 ai.g/hm² and CK, to determine the control effect on rice sheath blight and safety on rice seed. The results showed that the control effect on sheath blight by wet mixing was 90.46%-98.10% when seeds were treated with 24% thifluzamide 150-600 ai.g/hm² after 91 days. The control effect on sheath blight by dry mix treatment was 91.16%-99.28%. The control effect on sheath blight was poor when seeds were treated by soaking. The effect of each treatment on rice sheath blight slightly decreased after 108 days, but the trend was basically the same as 91 days after sowing. At the same time, all treatments had no adverse effect on rice germination, emergence and growth. Therefore, rice seed treatment with 24% thifluzamide SC should be used by wet mixing or dry mixing. In addition, from the perspective of control effect and economic cost, the recommended concentration should be 300-450 ai.g/hm², which has a good control effect on rice sheath blight and a long efficacy, and is safe for rice growth.

Key words: Rice Sheath Blight, Thifluzamide, Seed Treatment, Control Effect, Safety Evaluation