西宁地区草坪主要杂草种类和危害情况调查及其防除对策

2002年7月-2003年6月对西宁地区草坪主要杂草种类和危害情况进行了调查。结果表明：杂草共有18科38种。杂草种类最多的有菊科6种、豆科5种、禾本科4种、十字花科4种，其中又以菊科和豆科杂草的危害程度最大。草坪杂草在5—11月为危害期，5-9月为严重时期，采用机械防除和化学药剂防除，配合高水平的养护管理可得到有效的防治。

The species and damages of the main weeds in lawns in Xining city

The species and damages of the main weeds were investigated in lawns in Xining city during July 2002 to June 2003.The results showed that there are 38 species of weeds belonged to 18 families. Species of the dominant weeds are: six species of Compositae, five species of Viciaceae, four species of Cramineae and four species of Cruciferae, of which the heaviest harmfulness is from weeds of Compositae and Viciaceae. The weeds do harm to the lawns from May to November. The most serious period is from May to September. The weeds can be controlled by machine and herbicide. At the same time, with maintenance management, the weeds can be effectively prevented.