本文采用平均虫口密度、拥挤度和被害株率作为标准地的指标，对杨树蛀干害虫的危害状况作动态分析。
Dynamic analysis of poplar stem borer was done with population density, crowded level and percentage of damaged trees on sample plots.
本文采用平均虫口密度、拥挤度和被害株率作为标准地的指标，对杨树蛀干害虫的危害状况作动态分析。
Dynamic analysis of poplar stem borer was done with population density, crowded level and percentage of damaged trees on sample plots.
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