豚草属杂草(主要的有豚草 Ambrosiaartemisiifolia L.、三裂叶豚草 A.tri-fida L.等种)原产北美洲,是危险性的农田杂草。这类杂草植株高大(可高达2—3米),生长繁茂,传播蔓延迅速,可使大田、菜园、草场和牧场荒芜。苏联本世纪初从美洲传入这些杂草后(苏联1918年首次发现豚草,1935年首次发现三裂叶豚草),曾遭受草荒危害,当时苏联政府作出决议,责 Ragweed weeds (mainly Ambrosiaartemisiifolia L. and A.tri-fida L.) are native to North America and are dangerous farmland weeds. Plants of this weed are tall (up to 2-3 meters), grow vigorously and spread rapidly, leaving barren fields, vegetable gardens, pastures and ranches. After the Soviet Union introduced these weeds from the Americas at the beginning of this century (the first discovery of ragweed in 1918 in the Soviet Union and the discovery of Crassulaceae in 1935 for the first time in the Soviet Union), it suffered grass shortage and the Soviet government made a resolution