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Tolerance of Sweet Corn (Zea mays) to Clopyralid and EF-689

Published online by Cambridge University Press:  12 June 2017

John B. Masiunas  and
Michael S. Orfanedes
John B. Masiunas
Affiliation:
Dep. Hortic., Univ. IL 1201 W. Gregory Dr., Urbana, IL 68101
Michael S. Orfanedes
Affiliation:
Dep. Hortic., Univ. IL 1201 W. Gregory Dr., Urbana, IL 68101
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Abstract

Two experiments were conducted. The first experiment compared sweet corn tolerance to clopyralid at 0.2 to 1.1 kg ha-1, EF-689 at 0.07 to 0.6 kg ha-1 and 2,4-D at either 0.3 or 0.6 kg ha-1. Sweet corn tolerated all rates of clopyralid. EF-689 at 0.2 kg ha-1 or greater caused stalk curvature, stunting, and yield reductions. Stalk curvature also resulted from 2,4-D, but not stunting or yield reductions. The second experiment determined the effect of sweet corn genotype and growth stage at application on injury from EF-689. Injury was genotype and growth stage dependent. Stalk curvature was most severe from treatments 6 wk after emergence, whereas the greatest stunting was from treatments at 4 wk. ‘Supreme’ had the least and ‘Maple Sweet’ the most stalk curvature.

Keywords

Clopyralid, 3,6-dichloro-2-pyridine-carboxylic acidEF-689, 4-amino-3,5-dichloro-6-fluoro-2-pyridyloxyacetic acid2,4-D, (2,4-dichlorophenoxy)acetic acidsweet corn, Zea mays L.Growth regulators2,4-D
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 376 - 380
Copyright
Copyright © 1991 Weed Science Society of America 

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