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Influence of Application Time on Bioactivity of Imazethapyr in No-tillage Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Douglas D. Buhler  and
Richard T. Proost
Douglas D. Buhler
Affiliation:
Plant Sci. Res. Unit, U.S. Dep. Agric., Agric. Res. Serv., Dep. Agron. and Plant Genet., Univ. Minnesota, St. Paul, MN 55108
Richard T. Proost
Affiliation:
Nutrient and Pest Manag. Prog., Univ. Wisconsin, Madison, WI 53706
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Abstract

Field research was conducted at Arlington, WI, in 1988 and 1989 to determine the influence of application time on weed control and residue carryover with imazethapyr in no-tillage soybean production. Imazethapyr at ≥ 55 g ai ha−1 applied early preplant controlled > 90% of the common lambsquarters, velvetleaf, and giant foxtail before no-tillage planting of soybean. Early preplant and sequential treatments with an early preplant component controlled ≥ 88% of all weeds for the entire growing season. Delaying the initial imazethapyr application until immediately after soybean planting reduced weed control compared to the early preplant treatments. Low level of weed control with planting time treatments appeared to be due to a lack of control of common lambsquarters emerged at the time of imazethapyr application and dry weather following imazethapyr application. No soybean injury from imazethapyr was observed and differences in soybean yield appeared to be due to differences in weed control. No significant carryover of imazethapyr was detected through a corn bioassay in the field.

Keywords

Imazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidcommon lambsquarters, Chenopodium album L. # CHEALgiant foxtail, Setaria faberi Herrm. # SETFAvelvetleaf, Abutilon theophrasti Medik. # ABUTHcorn, Zea mays L. ‘Pioneer 3906’soybean, Glycine max (L.) Merr. ‘Northrup King 523-15’Conservation tillageearly preplantherbicide carryoverABUTHCHEALSETFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 122 - 126
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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