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Efficacy and Economics of Herbicides for Canada Thistle (Cirsium arvense) Control in No-till Spring Wheat (Triticum aestivum)

Published online by Cambridge University Press:  12 June 2017

William W. Donald
Affiliation:
Cropping Syst. Water Quality Res. Unit., Agric. Res. Serv., U. S. Dep. Agric., formerly of Agric. Res. Serv. Biosciences Res. Lab., and Dep. Crop and Weed Sci., North Dakota State Univ., Fargo, ND 58105
Tony Prato
Affiliation:
Dep. Agric. Econ., Univ. Missouri, Columbia, MO 65211

Abstract

The objective of this field research was to compare relative effectiveness and profitability of alternative herbicides applied to the same plots for four consecutive years for controlling and reducing dense Canada thistle infestations in no-till spring wheat. Chlorsulfuron at 30 g ai ha−1 plus nonionic surfactant or clopyralid plus 2,4-D at 70 plus 280 g ae ha−1, respectively, applied annually for 4 yr controlled Canada thistle and was more effective for gradually reducing Canada thistle stands than 2,4-D at 560 g ae ha−1, MCPA plus bromoxynil at 280 plus 280 g ae ha−1, or tribenuron at 20 g ai ha−1. Chlorsulfuron and clopyralid plus 2,4-D also controlled Canada thistle ≥ 90% earlier (by 2 yr) than other treatments. Stochastic dominance analysis, a form of economic analysis, predicted that either chlorsulfuron or clopyralid plus 2,4-D would be preferred by farmers to the untreated check, MCPA plus bromoxynil, or 2,4-D treatments. Chlorsulfuron also would be preferred to clopyralid plus 2,4-D by risk-neutral farmers, whereas clopyralid plus 2,4-D would be preferred to chlorsulfuron by highly risk-averse farmers, those who are most likely to pick only consistently effective herbicides.

Information

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1992 by the Weed Science Society of America 

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