【摘要】 为明确常用的8种杀菌剂施药不同次数后对水稻穗颈瘟的防治效果及在收获后稻米中的最终残留量，采用超高效液相色谱-串联质谱法(UPLC-MS/MS)分别检测、分析了不同杀菌剂施药1次、2次和3次后在稻米中的最终残留量及其对水稻穗颈瘟的防治效果。结果表明：相同药剂施药次数越多，对稻瘟病防治效果越好，但稻米最终残留量也越高。施药1次，吡唑醚菌酯和嘧菌酯防治效果>90%;施药2次，三环唑、吡唑醚菌酯和嘧菌酯防治效果>90%;施药3次，三环唑、稻瘟灵和嘧菌酯防治效果>90%。除稻瘟灵施药3次后最终残留超过最大残留限，其余药剂均未超标。综上所述，采用三环唑、嘧菌酯或吡唑醚菌酯分别在水稻破口期及齐穗期施药1次，能有效防治水稻穗颈瘟，无残留风险，适用于水稻绿色生产。更多还原

【Abstract】 The aim of this experiment was to determine the control effect of eight common fungicides on rice neck blast and the residue in rice after application at different frequencies. Three application frequencies were set up, including once, twice or three times in the experiment. We monitored the effect of different treatments on rice neck blast, and the method of ultra-high performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS) was used to determine the residue in different treatments of rice. The results showed that for any of these fungicides, the more times of application, the better the control effect of rice blast and the higher the reside of fungicide in rice. When applied once, the control efficacy of pyraclostrobin and azoxystrobin was more than 90%. When applied twice, the control efficacy of tricyclazole, pyraclostrobin and azoxystrobin was more than 90%. When applied three times, the control effect of tricyclazole, isoprothiolane and azoxystrobin was more than 90%. The final residue exceeded the maximum residue limit in the treatment of three times application of isoprothiolane, while other treatments in this experiment did not lead to excessive residues. In conclusion, the application of tricyclazole, pyraclostrobin or azoxystrobin once at the break stage and the other time at full heading stage can effectively control rice neck blast without residual risk, and is suitable for rice green production.更多还原