To screen excellent safety fungicides on controlling rice neck blast and rice false smut and to explore the effect of cooperative control of the two diseases, the efficacy of many kinds of fungicides, such as tebuconazole,etc. were tested at rice spike stage with field trials. The results showed that three triazole fungicides such as tebuconazole,epoxicon-azole,etc. and strobilurin fungicides such as azoxystrobin,etc. could reach a good control effect to rice neck blast and rice false smut, the field efficiency of those fungicides to rice false smut and rice neck blast were 83. 56%-88. 32% and 78. 61%-90. 93%, respectively. Fungicides such as tricyclazole, fenoxanil,isoprothiolane,etc. could reach a good control effect to rice neck blast, those field efficiency were 89. 68%-90. 66%. At late rice booting stage, tebuconazole was used to take rice false smut as the main control object as well as giving consideration to control rice neck blast, and azoxystrobin was used to focuse on controlling rice neck blast as well as giving consideration to control rice false smut at rice rupturing stage, the field efficiency to rice false smut and rice neck blast were 87. 87% and 85. 98%, respectively. In rice produc-tion, according to the optimum period of controlling the two disease and its occurrence trend, fungicides and its combination that had good effects to the two diseases were applied at late booting stage and within the period of rice rupturing stage to full heading stage for a good cooperative control effect to the two diseases.%为筛选防治稻曲病、水稻穗颈瘟高效、安全的药剂及探讨两病协同防治的效果，对戊唑醇等多种杀菌剂进行了水稻穗期防治稻曲病、穗颈瘟田间药效试验。结果表明：戊唑醇、氟环唑等三唑类杀菌剂及嘧菌酯等甲氧基丙烯酸酯类杀菌剂对稻曲病、穗颈瘟均具有较好的防治效果，防治效果分别为83.56%~88.32%和78.61%~90.93%。三环唑、稻瘟酰胺、稻瘟灵等杀菌剂对穗颈瘟具有较好的防治效果，防治效果达89.68%~90.66%。在孕穗末期使用戊唑醇主治稻曲病，兼治穗颈瘟；在破口期使用嘧菌酯主治穗颈瘟，兼治稻曲病，对稻曲病、穗颈瘟的防治效果可达87.87%和85.98%。为此，生产上可根据两病的防治适期及两病发生趋势预测，选择对两病具有良好防治效果的药剂及药剂组合，在水稻孕穗末期和破口期至齐穗期合理施用，可达到协同防治两病的目的。
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