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Spring Wheat (Triticum aestivum) Management Can Substitute for Diclofop for Foxtail (Setaria spp.) Control

Published online by Cambridge University Press:  12 June 2017

Mohammad Khan ,
William W. Donald  and
Tony Prato
Mohammad Khan
Affiliation:
Crop and Weed Sci. Dep., North Dakota State Univ., Fargo 58105
William W. Donald
Affiliation:
Agric. Res. Inst., Tarnab (Peshawar) NSFP, Pakistan; Res. Agron., Cropping Systems and Water Quality Res. Unit, Agric. Res. Serv., U.S. Dep. Agric., 244 Agric. Engr., Univ. Missouri, Columbia, 65211, formerly of the ARS Biosciences Res. Lab., Fargo, ND
Tony Prato
Affiliation:
Dep. Agric. Econ., Univ. Missouri, Mumford Hall, Columbia 65211
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Abstract

The goal of this research was to determine whether crop management practices could substitute for a herbicide for managing mixed populations of green and yellow foxtail in hard red spring wheat. Crop yield and foxtail growth were measured in two years of field research in North Dakota. Spring wheat yields were as great or greater when early seeding date or 2× seeding rate were substituted for POST diclofop3 at 0.75 kg ai ha−1 for managing foxtail in spring wheat. Yield of spring wheat competing with foxtails was greater for the high seeding rate (2× = 270 kg ha−1) than both the normal (1× = 130 kg ha−1) and low (0.5× = 70 kg ha−1) seeding rates for early or middle seeding dates, but not for the late seeding date. For both early and middle seeding dates, wheat yield at the 2×seeding rate without diclofop was equal to or greater than that of the 1× seeding rate with diclofop. Late-seeded wheat did not yield well in competition with dense foxtail stands for any treatment combination. Early and middle seeding dates favored the relative increase of green foxtail over yellow foxtail in wheat, whereas late seeding favored yellow foxtail over green foxtail. Economic analysis demonstrated that early seeding date was the most critical factor in determining the stochastic dominance of treatments without diclofop over treatments with diclofop. Seeding rate was much less important than seeding date in determining the ranking of treatments in stochastic dominance analysis.

Keywords

Diclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acidgreen foxtail, Setaria viridis (L.) Beauv. ♯ SETVIyellow foxtail, Setaria glauca (L.) Beauv. ♯ SETLUspring wheat, Triticum aestivum L. ‘Wheaton.’Crop managementeconomicsplantingseeding rateseeding datestochastic dominancesustainable agriculturediclofop
Type
Weed Management
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 362 - 372
Copyright
Copyright © 1996 by the Weed Science Society of America 

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