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Preemergence Broadleaf Weed Control and Crop Tolerance in Imidazolinone-Resistant and -Susceptible Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Christy L. Sprague ,
Edward W. Stoller  and
Stephen E. Hart
Christy L. Sprague
Affiliation:
Department of Crop Science, University of Illinois
Edward W. Stoller
Affiliation:
USDA-ARS, Department of Crop Science, University of Illinois
Stephen E. Hart
Affiliation:
Department of Crop Science, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
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Abstract

Field studies were conducted in 1994 and 1995 at Dekalb and Urbana, IL, to evaluate preemergence broadleaf weed control and crop tolerance in imidazolinone resistant (IR) and susceptible (non-IR) corn using atrazine, imazethapyr, AC 263,222, CGA-152005, MON 12000 with and without MON 13900 (a safener), and flumetsulam + clopyralid. When sufficient rainfall occurred within 28 d of application to insure herbicide absorption, the IR corn variety was more tolerant than the susceptible variety to imazethapyr, AC 263,222, CGA-152005 at 40 and 80 g/ha, and MON 12000 with and without MON 13900. Overall crop tolerance of IR corn was equal to that of corn treated with atrazine for all herbicide treatments except CGA-152005, which injured IR corn. Control of velvetleaf, common lambsquarters, Pennsylvania smartweed, tall morningglory, and jimsonweed for all herbicide treatments was equal or superior to that of atrazine at 1.7 kg/ha. However, control of common cocklebur was significantly greater with atrazine compared to imazethapyr and the low rate of CGA-152005.

Keywords

clopyralid, 3,6-dichloro-2-pyridinecarboxylic acidflurazole, phenylmethyl- 2- chloro- 4-(trifluoromethyl)- 5- thiazolecarboxylatecommon cocklebur, Xanthium strumarium L. # XANSTcommon lambsquarters, Chenopodium album L. # CHEALjimsonweed, Datura stramonium L. # DATSTPennsylvania smartweed, Polygonum pensylvanicum L. # POLPYtall morningglory, Ipomoea purpurea (L.) Roth # PHBPUvelvetleaf, Abutilon theophrasti Medik. # ABUTHcorn, Zea mays L.Atrazine alternativesAC 263,222CGA-152005flumetsulamMON 12000imazethapyrIR cornALS, acetolactate synthaseIR, imidazolinone-resistant
Type
Research
Information
Weed Technology , Volume 11 , Issue 1 , March 1997 , pp. 118 - 122
Copyright
Copyright © 1997 by the Weed Science Society of America 

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