中文摘要：

一些带菌禾草能导致取食动物产生中毒症状．在内蒙古草原上，羽茅（Achnatherumsibiricum）带菌率高且稳定存在，而同属带菌植物能导致取食牲畜产生中毒症状，带菌羽茅也可能会来危害．因此，选择了一种有效的杀真菌剂丙环唑（Propiconazole），在种子、幼苗和成株3个层次上进行处理，探索适合杀除羽茅内生真菌的方法．结果显示，用4．00a．i．btL／g种子的丙环唑浸种4h可有效降低羽茅种子中内生真菌感染率；用4．00～6．00a．i．g／L丙环唑进行叶片喷施，处理萌发7d的幼苗和成株，能获得较高的存活率和杀菌率．这为控制羽茅内生真菌提供了几种可行的方法．

英文摘要：

Some grasses could bring the grazers toxicity syndromes due to alkaloids pro- duced by the endophytes, attracting much attention. In the Inner Mongolia steppe, Achnatherum sibiricum （Linn.） Keng was found harboring endophytes at a high rate. It was reported that the grasses in Achnatherum genus with endophytes could cause ＂summer syn- drome＂ and ＂staggers disease＂ to the grazers, so A. sibiricum with endophytes may also have toxicity at potential risks. Therefore, in this study, an effective fungicide, Propiconazole （Prop.）, was chosen~to treat the A. sibiricum on the seed, seedling and adult plant levels. The results showed that at the concentration of 4.00 a.i. L/g seed, Prop. can significantly reduce the vitality of the endophytes in seeds after being dipped for 4 h. When sprayed on the leaves at 4.00~6.00 a.i. g/L, Prop. can most effectively eliminate the fungi out of 7 days old seedlings and adult ramet with a high survival rate.