大豆菟丝子又称黄金狗丝草、无根草 ,是一种恶性寄生杂草。大豆菟丝子藤茎丝线状 ,黄色或淡黄色 ,先端能旋转 ,接触到大豆等寄主就缠绕在寄主茎上 ,生长吸根伸入寄主皮内 ,吸取大豆体内养料和水分 ,使大豆生长不良或枯死。菟丝子果实球形 ,内有种子 2～ 4粒 ;种子表面粗糙 ,淡 Soy dodder, also known as gold dog grass, rootless grass, is a vicious parasitic weeds. Soy cocoon cane filamentous, yellow or light yellow, apex can rotate, contact with the host of soybeans and other host wound on the host, the growth of root penetration into the host skin, absorb the nutrients and water in soy so that the growth of poor or dead soybean . Dodder fruit spherical, there are seeds 2 to 4; seed surface roughness, light