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Sweet Corn (Zea mays) Hybrids Respond Differently to Simulated Imazethapyr Carryover

Published online by Cambridge University Press:  12 June 2017

Thomas L. Rabaey  and
R. Gordon Harvey
Thomas L. Rabaey
Affiliation:
Department of Agronomy, University of Wisconsin, Madison. WI 53706-1597
R. Gordon Harvey
Affiliation:
Department of Agronomy, University of Wisconsin, Madison. WI 53706-1597
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Abstract

Eleven sweet corn hybrids representing a wide range of injury with imazethapyr in a greenhouse study were evaluated in simulated imazethapyr carryover field studies conducted at Arlington, WI. Imazethapyr at 0, 11, 22, and 44 g ai/ha was applied and incorporated 15 d prior to planting sweet corn. The greatest injury occurred 28 d after planting, with reductions in height ranging from 0 to 25%. Reductions in corn ear yields were similar all years for 10 of the 11 hybrids. Reductions in corn ear yield for ‘Crisp N’ Sweet 710,’ ‘Cornucopia,’ ‘Super Sweet Jubilee,’ ‘Excellency,’ and ‘DMC 20–35′ were less than for ‘Natural Sweet 9000,’ ‘Jubilee,’ ‘Zenith,’ ‘Green Giant 40,’ and ‘Green Giant 97.’ In 1992, plots were prepared for an actual imazethapyr carryover study by applying imazethapyr PPI at 70 and 140 g/ha and planting soybean. In 1993, four sweet corn hybrids were planted. Corn ear yield of Green Giant 97 was reduced following previous-year applications of 140 g/ha imazethapyr. Corn ear yields of Excellency, Super Sweet Jubilee, and Jubilee were not reduced at either actual carryover rate. These studies indicate variability among sweet corn hybrids in susceptibility to imazethapyr. Greenhouse results were indicative of field responses and may be useful as a rapid test to determine hybrid susceptibility.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidsoybean, Glycine max (L.) Merr.sweet corn, Zea mays LCrop rotationherbicide carryoversweet corn injurysweet corn toleranceDAP, days after planting
Type
Research
Information
Weed Technology , Volume 11 , Issue 1 , March 1997 , pp. 92 - 97
Copyright
Copyright © 1997 by the Weed Science Society of America 

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