稻瘟病是最主要的世界性水稻病害，化学防治是目前最为有效的防控措施。通过室内生测和田间试验相结合的方法，测试了多个特效药剂和广谱药剂对稻瘟病的防治效果，探讨了稻瘟病的最优防治适期和穗颈瘟、稻曲病兼防的可能性。结果表明，三环唑仍然是预防穗颈瘟的特效杀菌剂，而嘧菌酯、肟菌酯·戊唑醇和嘧菌酯·苯醚甲环唑等广谱杀菌剂对叶瘟表现出更好的防控效果。始穗期是防治穗颈瘟的关键时期，在发病严重的情况下在齐穗期再施1次药是必要的。如果选用合适的药剂，破口前施药对穗颈瘟也有一定的防控作用。由于防治稻曲病的最佳施药时期是破口前，因此，一次施药兼防穗颈瘟和稻曲病是可行的。

Rice blast is the main rice disease, and chemical control is the most effective measures at present. This study tested the control effects of some rice blast control specific fungicides and broad-spectrum fungicides, discussed the optimal control period of rice blast, the possibility of combination control rice false smut and rice neck blast through the method of field control experiment combination with indor test. The results showed that tricyclazole was still the best fungicide to control rice neck blast. The broad-spectrum fungicides, such as azoxystrobin, trifloxystrobin·tebuconazole and azoxystrobin·difenoconazole, showed better performance in controlling leaf blast; initial heading stage was the best stage for controlling rice neck blast, it was necessary to give another chemical spray in full heading stage when neck blast very serious. 5~7 days before heading stage was the best stage to control false smut of rice, there was also some effects for controlling rice neck blast. Therefore, it is feasible to control rice neck blast and rice false smut at one time.