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Tolerance of Foxtail Millet to Combinations of Bromoxynil, Clopyralid, Fluroxypyr, and MCPA

Published online by Cambridge University Press:  20 January 2017

William E. May ,
Eric N. Johnson ,
Dan J. Ulrich ,
Christopher B. Holzapfel  and
Guy P. Lafond
William E. May*
Affiliation:
Agriculture and Agri-Food Canada, Indian Head Research Farm, P.O. Box 760, Indian Head, SK, Canada, S0G 2K0
Eric N. Johnson
Affiliation:
Agriculture and Agri-Food Canada, Scott Research Farm, P.O. Box 10, Scott, SK, Canada, S0K 4A0
Dan J. Ulrich
Affiliation:
Agriculture and Agri-Food Canada, Scott Research Farm, P.O. Box 10, Scott, SK, Canada, S0K 4A0
Christopher B. Holzapfel
Affiliation:
Indian Head Agricultural Research Foundation, P.O. Box 156, Indian Head, SK, Canada, S0G 2K0
Guy P. Lafond
Affiliation:
Agriculture and Agri-Food Canada, Indian Head Research Farm, P.O. Box 760, Indian Head, SK, Canada, S0G 2K0
*
Corresponding author's E-mail: mayb@agr.gc.ca.
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Abstract

When solid stands of foxtail millet are cut for swath grazing, the grazing season for cattle is extended and winter feeding costs reduced. The economic success of this practice depends on inexpensive weed control. Eight single- and double-rate herbicide combinations (g ai/ha) were evaluated and compared to a weed-free check: MCPA + bromoxynil (280 + 280 or 560 + 560); MCPA + clopyralid (560 + 100 or 1120 + 200); MCPA + fluroxypyr (562 + 108 or 1124 + 216); and MCPA + clopyralid + fluroxypyr (560 + 100 + 144 or 1120 + 200 + 288). This study was conducted at Indian Head, Saskatchewan (SK) in 2004, 2005, 2006, and 2007 and at Scott, SK, in 2006 and 2007. Crop injury and dry matter yield were measured. Results of the study indicate that crop injury exceeded 20% at only one out of six sites at 7 to 14 d after herbicide treatment. Double-rate MCPA + bromoxynil treatments had higher injury ratings than the weed-free check 7 to 14 d after treatment in all site years. As the growing season progressed, injury ratings tended to decline except at Scott in 2007, where injury ratings at the 21 to 35 d period were numerically greater than the other two rating periods. There were no differences among treatments for crop biomass production. We conclude that all four herbicide combinations at the labeled rate are safe to use on foxtail millet in Saskatchewan, and probably in other areas with similar environmental growing conditions.

Keywords

BromoxynilclopyralidfluroxypyrMCPAfoxtail millet, Setaria italica (L.) P. BeauvBiomass yieldforage‘Golden German Millet’Italian milletswath grazing
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 23 , Issue 1 , March 2009 , pp. 94 - 98
Copyright
Copyright © Weed Science Society of America 

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References

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