不同地理种群甘薯茎线虫对不同类型杀线剂的敏感性

Susceptibility of Different Populations of Ditylenchus destructor to Different Type of Nematicides in Hebei Province of China

采用浸渍法和沙柱法测定了河北省昌黎、涿州、卢龙和抚宁四地的甘薯茎线虫对涕灭威、灭线磷、阿维菌素的敏感性。浸渍法结果表明,昌黎甘薯茎线虫种群对涕灭威、灭线磷的LC50分别为891.73、743.82mg/L,其它三地涿州、卢龙和抚宁甘薯茎线虫种群对涕灭威、灭线磷的敏感性均有所降低,与昌黎种群相比较,其对涕灭威的抗性倍数分别为4.0、3.5和3.7倍,对灭线磷的抗性倍数分别为3.8、2.1和1.6倍;阿维菌素在400mg/L以下时,各种群的死亡率均在45%以下,为600mg/L时其死亡率陡增,均为90%以上,且无显著性差异。沙柱法结果表明,5mg/L的涕灭威和50mg/L的灭线磷对线虫的活动能力具有很好的抑制作用,50mg/L的阿维菌素抑制作用则相对较低。

Four populations of Ditylenchus destructor were collected from different areas of Hebei Province and their susceptibilities to 3 different types of nematicides were tested with contact assays and sand column methods in laboratory. The contact assays results showed that the Changli populations were more sensitive to aldicarb and ethoprophos, the values of LC50 were 891.73 and 743.82 mg/L, respectively. The other populations had lower susceptibilities to aldicarb and ethoprophos. The sus- ceptibilities of the three populations had 3.5 to 4.0 fold difference to aldicarb, and 1.6 to 3,8 fold to ethoprophos. The susceptibilities of the four populations to abamectin were no significant difference. The results of sand column assays showed that the movement of nematode could be inhibited by 5 mg/L aldicarb and 50 mg/L ethoprophos. The inhibition of 50 mg/L abamectin on nematodes movement was lower than that of aldicarb and ethoprophos.