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[目的]明确甲霜灵和嘧菌酯对福建省大豆疫霉菌的毒力。[方法]采用菌丝生长速率法测定了2013—2015年采自福建省大豆主产区180个大豆疫霉菌株对甲霜灵和嘧菌酯的敏感性。[结果]甲霜灵对180个菌株的平均EC50值为(0.2044±0.0243)mg/L,其中厦门云洋的菌株较漳州榜山和罗坑的菌株敏感。嘧菌酯对180个菌株的平均EC50值为(1.0952±0.0924)mg/L,其敏感性呈连续单峰曲线分布,可作为大豆疫霉菌对嘧菌酯抗药性监测的敏感性基线。[结论]福建省大豆疫霉菌对甲霜灵和嘧菌酯均敏感,但甲霜灵的抗性呈上升趋势,具有较大的抗性风险。
[Objective] To determine the toxicity of metalaxyl and azoxystrobin to Phytophthora sojae in Fujian Province. [Method] The mycelial growth rate method was used to determine the sensitivity of 180 Phytophthora sojae strains to metalaxyl and azoxystrobin from 2013 to 2015 in main soybean producing areas of Fujian Province. [Result] The average EC50 value of metalaxyl on 180 strains was (0.2044 ± 0.0243) mg / L, among which the strain of Yunyang in Xiamen was more sensitive than the strains of Banshan and Luokeng in Zhangzhou. The average EC50 value of azoxystrobin against 180 isolates was (1.0952 ± 0.0924) mg / L, and its sensitivity showed a continuous unimodal curve distribution, which could be used as the sensitive baseline for azoxystrobin resistance to azoxystrobin. [Conclusion] Phytophthora sojae was sensitive to metalaxyl and azoxystrobin in Fujian Province, but the resistance of metalaxyl increased with the risk of resistance.