ulmus

1.Ivela ochropoda is one of the main defoliator pest occurred in Ulmus pumila, and is very serious in Wuqi County.

摘要榆毒蛾是榆树的食叶害虫之一，在吴生严重。

2.8.The results showed: 1) there are in evidence the land vegetation of warm temperate zone in \%Ulmus lamellose \%communities and the property of the north temperate zone in the flora;

结果明 :1)脱皮榆群有暖温带地带性植被的特点 ,区系成分有北温带性质。