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Imazethapyr for Weed Control in No-Till Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

William E. Lueschen  and
Thomas R. Hoverstad
William E. Lueschen
Affiliation:
Univ. Minn., South. Exp. Sta., Waseca, MN 56093
Thomas R. Hoverstad
Affiliation:
Univ. Minn., South. Exp. Sta., Waseca, MN 56093
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Abstract

Lack of consistent weed control has been a major limiting factor in the adoption of no-till soybean production. Field studies were conducted at Waseca, MN from 1987 through 1990 to evaluate the efficacy of imazethapyr applied either alone or in combination with other herbicides for weed control in no-till soybean. Fall applications of imazethapyr did not provide acceptable weed control. Imazethapyr applied 2 to 4 wk before planting provided a weed-free seedbed whereas burndown treatments applied 1 to 3 d before planting failed to do so. Early preplant imazethapyr applied during the second week of April did not control weeds as well as imazethapyr applied during the last week of April. Imazethapyr applied alone PRE failed to control weeds adequately. A split application of early preplant plus PRE imazethapyr resulted in excellent weed control, especially when metribuzin was added with each application. Imazethapyr is a promising herbicide for weed control in no-till soybean production.

Keywords

Imazethapyr, (±)2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onesoybean, Glycine max (L.) Merr.Conservation tillageearly preplantmetribuzinAbutilon theophrastiAmaranthus retroflexusChenopodium albumSetaria faberiABUTHAMARECHEALSETFA
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 845 - 851
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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