攀西地区烟草黑胫病菌对甲霜灵的抗药性

为了评估攀西地区烟草黑胫病菌对甲霜灵的抗药性,对从不同地点采集的89个黑胫病菌菌株进行甲霜灵抗药性检测。结果表明,供试菌株中有3株对甲霜灵敏感,22株对甲霜灵敏感性处于中间状态,64株抗甲霜灵。敏感菌株、中间菌株和抗性菌株分别占总体的3.37%、24.72%和71.91%。不同地区的菌株对甲霜灵的敏感性存在差异,其中以仁和地区的菌株最为敏感,EC50值最低0.676 2 mg/L,平均为1.478 4 mg/L;而其他地区的菌株表现出一定的抗药性,平均EC50为3.085 7 mg/L,最高达6.318 1 mg/L。

Determination of Phytophthora parasitica var.nicotianae Resistance to Metalaxyl in Panxi Region

In order to evaluate resistance risk of Phytophthora parasitica var.nicotianae to metalaxyl in Panxi region,89 strains from different locations were determined for their resistance to metalaxyl.The results showed that 3 isolates were sensitive to metalaxyl,22 isolates intermediately sensitive and 64 isolates resistant.The metalaxyl-sensitive isolates,intermediate isolates and resistant isolates covered 3.37%,24.72% and 71.91% in isolate population,respectively.There was also a significant difference in the sensitivity of the strains from different areas to metalaxyl.The strains from Renhe were the most sensitive,with the minimum and mean EC50 values of 0.6762mg/L and 1.4784mg/L,respectively,while the other strains presented some resistance,with the mean EC50 value of 3.0857mg/L and the maximum value of 6.3181mg/L.