据查阅资料,全世界每年因病、虫、草害造成作物减产的产值高达204亿美元,其中草害占第一位,为42％;虫害为28％;病害为27％;线虫3％。在林业生产中,幼林地的连续三年抚育,是千方百计地想把杂草消灭掉,然而,这繁重的除草方式也仅仅能清除那些浅根性的杂草,对地下根(或根状茎)萌芽繁殖强的杂草,只能达到短期抑制生长的作用。 According to the access to information, the world each year due to diseases, insects and weeds caused by crop production output value reached 20.4 billion US dollars, of which the first grass which accounted for 42%; pests 28%; disease 27%; nematodes 3%. In forestry production, young forest land is maintained for three years in a row, trying every means to eliminate weeds. However, this heavy weeding method can only clear those shallow root weeds, and underground roots (or rhizomes) Sprouting strong weeds can only achieve the role of short-term inhibition of growth.