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Weed Control and Crop Injury in Ecofallow Corn (Zea mays) Using Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Gail A. Wicks,
Garold W. Mahnken and
Gordon E. Hanson
Gail A. Wicks
Affiliation:
University of Nebraska, Department of Agronomy, North Platte, NE 69101
Garold W. Mahnken
Affiliation:
University of Nebraska, Department of Agronomy, North Platte, NE 69101
Gordon E. Hanson
Affiliation:
University of Nebraska, Department of Agronomy, North Platte, NE 69101
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Abstract

Imidazolinone-resistant and -tolerant corn hybrids give growers a new weed control option. Field experiments were conducted in 1993 and 1994 to evaluate imazethapyr for controlling weeds in no-till corn planted into winter wheat stubble in a winter wheat–ecofallow corn rotation. Imidazolinone-tolerant (IT) and imidazolinone-resistant (IR) corn were protected genetically from injury by imazethapyr that was applied preplant, preemergence, or postemergence to ‘Pioneer Brand 3417,’ ‘Pioneer Brand 3417 IR,’ ‘ICI Seeds 8532,’ and ‘ICI Seeds 8532 IT’ hybrids. No difference in corn injury occurred between IR and IT corn. Imazethapyr applied to resistant or tolerant corn hybrids could be used to control weeds in ecofallow corn. Imazethapyr at 35 or 70 g ai/ha controlled triazine-resistant kochia better than the standard herbicide treatment of metolachlor plus cyanazine.

Keywords

Cyanazine, 2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl]amino]-2-methylpropanenitrileimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidmetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidekochia, Kochia scoparia (L.) Schrad. # KCHSCcorn, Zea mays L.winter wheat, Triticum aestivum L., ‘Arapahoe.'Conservation tillageecofarmingherbicide resistanceno-till plantingCCHPAKCHSCSETVIDAP, days after plantingDBP, days before plantingGDD, growing degree daysIR, imidazolinone-resistantIS, imidazolinone-susceptibleIT, imidazolinone-tolerantPOST, postemergencePR preplantPRE, preemergenceTR, triazine resistant* = significant at P = 0.05 level** = significant at P = 0.01

Information

Type
Research
Information
Weed Technology , Volume 11 , Issue 4 , December 1997, pp. 748 - 754
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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