禾本科牧草在生长过程中分蘖多，长势快，抑制杂草的生长，而豆科牧草和菊科牧草苗期长势缓慢，在与杂草杂草竞争中处于劣势。
Grass forages grow fast and have many tillers, which restrained weeds effectly. While leguminous and composite fodder grow slowly which is at disadvantage on competing with weeds during seedling.
加拿大帝国商业银行成功地使用了一种原产于墨西哥的以种子为食的象鼻虫来控制讨厌的帕特农杂草，这种杂草已知会对印度和澳大利亚的农业和人类健康产生负面影响。
CIBC successfully used a seed-feeding weevil, native to Mexico, to control the obnoxious parthenium weed, known to exert devious influence on agriculture and human health in both India and Australia.
尼尔森苦笑着掐断手中杂草的花，把杂草弄死。
As he crumples the flowering end of the weed in his hand, Nelson grimaces.
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