2004年调查了14个州,涉及3 710万hm2,约占美国小麦种植面积的85%,其中有45%的小麦喷施了除草剂,而2002年这14个州的小麦仅占全国种植面积的75%(Agrowibid)。小麦上最广泛施用的除草剂有甲磺隆(15%)、2,4-滴(13%)、草甘膦(13%)、苯磺隆(10%)、噻吩磺隆(9%)和氯磺隆(8%)。该区域 In 2004, 14 states were surveyed, involving 37.1 million hm2, accounting for about 85% of the area planted with wheat in the United States. 45% of the wheat was sprayed with herbicides. In 2002, the 14 states accounted for only the national planted area Of 75% (Agrowibid). The most widely used herbicide on wheat is metsulfuron (15%), 2,4- (13%), glyphosate (13%), tribenuron-methyl And chlorsulfuron (8%). The area