恶性杂草的危害现状及生物防治应用前景

Present Situation of Vicious Weeds and Weed Biological Control in Future.

杂草危害是一种世界性问题。据报道，全世界１９７２年因杂草而造成的经济损失高达２０４亿美元。美国每年因杂草造成的损失占病虫草害总损失的４２％。我国北方草原区毒害草蔓延，危害日甚，每年引起数万头牲畜中毒死亡，造成的经济损失是巨大的。采用人工拔除和化学药剂除草代价昂贵，收效甚微。长期大量施用化学除草剂会引起严重的环境污染和破坏生态平衡。本文主要从生态学、经济学、美学和环境方面论述和介绍了生物防治杂草的应用前景和对策，对指导草地毒害草的生物防治是一个新启示和新思路。

Weed pest is a serious problem on word.On a world scale,production loss due-to weeds have been estimated at 20400 million per aumum.Vicious weed is also serious in Rangeland of Northern China.Weed Biological Control is sate and effective.In this pa-per,abont weed biological control is discussed.