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笔者 1 998～ 1 999年对天牛、黄刺蛾 Cnidocampa flavescens(Walker)危害美洲黑杨、意杨的情况作了调查和分析。结果表明 :美洲黑杨对这两种害虫具有一定抗性
From 1998 to 1999, the author investigated and analyzed the damage of Cnidocampa flavescens (Walker) against Populus tomentosa and Populus euphratica in Tian Bei and Ye Yang. The results showed that Populus nigra had some resistance to these two pests