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通过研究,搞清杨树小叶病为土壤缺乏有效锌所致。采用树冠喷施1%、2%的硫酸锌溶液后防效较好,树高和胸径生长量与对照相比,差异都极显著。
Through research, find out that poplar leaf disease is caused by the lack of available zinc in the soil. The control effect of spraying 1% and 2% zinc sulfate solution on canopy was better, and the difference of tree height and DBH growth was significant compared with the control.