Table 6.

Top five agricultural chemicals applied (by percent treated acres), by crop.^a

Chemical	Percent of treated acres	Chemical class	Carcinogenic potential
Barleyb
2,4-D	35	Chlorphenoxy acid/ester	D-not classifiable
MCPA	22	Chlorphenoxy acid/ester	Not likely
Bromoxynil	14	Hydroxybenzonitrile	C-possible carcinogen
Tribenuron methyl	12	Sulfonylurea	C-possible carcinogen
Thifensulfuron	8	Sulfonylurea	Not listed
Cornc
Atrazine	70	Triazine	Not likely
Metolachlor	24	Chloroacetanilide	C-possible carcinogen
Acetochlor	24	Chloroacetanilide	Likely carcinogen
Dicamba	21	Benzoic acid	D-not classifiable
Nicosulfuron	12	Sulfonylurea	E-evidence of noncarc
Cotton-uplandc
Trifluralin	50	2,6-Dinitroaniline	C-possible carcinogen
Ethephon	33	Organophosphate	D-not classifiable
Tribufos	31	Organophosphate	Likely at high dose only
Fluometuron	29	Urea	E-evidence of noncarc
Aldicarb	23	N-methyl carbamate	E-evidence of noncarc
Oatsb
2,4-D	13	Chlorphenoxy acid/ester	D-not classifiable
MCPA	6	Chlorphenoxy acid/ester	Not likely
Dicamba	3	Benzoic acid	D-not classifiable
Glyphosate	2	Phosphonoglycine	E-evidence of noncarc
Chlorsulfuron	2	Sulfonylurea	E-evidence of noncarc
Soybeansc
Glyphosate	45	Phosphonoglycine	E-evidence of noncarc
Imazethapyr	26	Imidazolinone	E-evidence of noncarc
Pendimethalin	19	2,6-Dinitroaniline	C-possible carcinogen
Trifluralin	16	2,6-Dinitroaniline	C-possible carcinogen
Chlorimuron ethyl	12	Sulfonylurea	Not listed
Wheat (spring, winter)d
2,4-D	38	Chlorphenoxy acid/ester	D-not classifiable
MCPA	24	Chlorphenoxy acid/ester	Not likely
Dicamba	17	Benzoic acid	D-not classifiable
Tribenuron methyl	13	Sulfonylurea	C-possible carcinogen
Fenoxyprop	12	Aryloxyphenoxy propionic acid	Not listed

Abbreviations: 2,4-D, 2,4-dichlorophenoxyacetic acid; MCPA, 4-chloro-2-methylphenoxyacetic acid; noncarc, noncarcinogenicity.

^aData from USDA (2006) and U.S. EPA (2004). Multiyear data are means.

^b1998 data only.

^c1995–2001 data.

^d1995–1998, 2000 data; durum wheat excluded because it is grown only in North Dakota.