Poplar is also a species pest occurred more, poplar leaf blight disease is one of the main disease which has a serious impact on many aspects of poplar benefits.

杨树也是一种病虫害发生较多的树种，其中杨树叶枯病作为其中的一项主要病害，严重影响了杨树诸多方面效益。

youdao

This paper deals with leaf, stem and root growth of ten kinds (including clones, varieties and species) of one year poplar seedlings grown from cuttings.

本文对十个杨树种类(其中有无性系、变种，和种)一年生插条苗的叶、茎和根的生长及相互关系进行了研究。

youdao

The vertical distribution and seasonal change of leaf are a were studied in intensive and extensive culture poplar plantations.

本文对集约经营与粗放经营杨树人工林分的叶面积垂直分布及其季节动态变化进行了对比研究。

youdao