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Corn (Zea mays) Injury Following Use of Clomazone, Chlorimuron, Imazaquin, and Imazethapyr

Published online by Cambridge University Press:  12 June 2017

William S. Curran ,
Ellery L. Knake  and
Rex A. Liebl
William S. Curran
Affiliation:
Dep. Agron., Univ. Ill., 1102 S. Goodwin Ave., Urbana, IL 61801
Ellery L. Knake
Affiliation:
Dep. Agron., Univ. Ill., 1102 S. Goodwin Ave., Urbana, IL 61801
Rex A. Liebl
Affiliation:
Dep. Agron., Univ. Ill., 1102 S. Goodwin Ave., Urbana, IL 61801
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Abstract

This study examined the response of corn to clomazone, chlorimuron, imazaquin, and imazethapyr the year following their application to soybeans. Herbicides were surface-applied from one-half to three times the labeled application rates. Soybeans were planted the year of application and crop tolerance was evaluated. Corn was planted in rotation the following season. Soybeans were tolerant of all four herbicides. The highest rates of clomazone, chlorimuron, and imazaquin injured the corn early in the season. Imazethapyr did not influence corn growth. Visual estimates of clomazone injury were as high as 39% chlorosis. Seedling dry weight reductions at the highest chlorimuron and imazaquin rates were 32% and 24%, respectively. Although corn was injured by higher rates of clomazone, imazaquin, and chlorimuron at the 3-leaf stage, none of the herbicides significantly reduced grain yield. This study suggests that these herbicides can carry over and injure corn, especially if labeled application rates are exceeded. However, low to moderate early season injury to corn may not affect grain yield.

Keywords

Clomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinonechlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]-carbonyl]amino]sulfonyl]benzoic acidimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1 H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidcorn, Zea mays L. ‘Pioneer 3377’soybean, Glycine max (L.) Merr. ‘Williams'Dissipationcarryovercrop injury
Type
Research
Information
Weed Technology , Volume 5 , Issue 3 , September 1991 , pp. 539 - 544
Copyright
Copyright © 1991 Weed Science Society of America 

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