Chemical
-by important Iowa herbicide families and individuals
-weed control usage
-herbicide physiology: MOA; MOD; selectivity; other
-herbicide resistance
-weeds
-crops
-injury symptomology
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Herbicide Use in Iowa*
Corn: % acres Soybeans: % acres Total: % acres Rank
ACCase inhibitors 60.4% 60.4% 5 clethodim 11.5%
fenoxaprop 15.9%
fluazifop 17.5%
quizalofop 6%
sethoxydim 9.5%
ALSase inhibitors 22.2% [+] 109% 131.2% 1
chlorimuron 10.4%
halosulfuron 1.9%
imazaquin 4.4%
imazethapyr 76%
nicosulfuron 15.8%
primisulfuron 4.5%
prosulfuron ? %
thifensulfuron 18.6%
Aromatic carboxylic acids 49.6% 13.9% 63.5% 4 dicamba 35.7%
2,4-D 13.9% 13.4%
2,4-DB 0.5%
Bentazon 6.2% 10.3% 16.5% 8
Bromoxynil 14.8% 14.8% 9
Chloracetamides 64.9% 5.6% 70.5% 3 acetochlor 26.5%
alachlor 2.2% 1.1%
metolachlor 35.7% 1%
propachlor 0.5%
Dinitroanilines 59.9% 59.9% 6
ethalfluralin 1.7%
pendimethalin 27.9%
trifluralin 30.3%
Diphenyl ethers 5.6% 5.6% 10 acifluorfen 2.3%
fomesafen 1.9%
lactofen 1.4%
Glyphosate 2.6% 19.9% 22.5% 7
Triazines 89% 2.2% 91.2% 2
atrazine 67.2%
cyanazine 18.6%
metribuzin 2.2% 2.2%
simazine 1%
* % acres treated; Hartzler, 1994
