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Downy Brome (Bromus tectorum) Interference and Economic Thresholds in Winter Wheat (Triticum aestivum)

Published online by Cambridge University Press:  12 June 2017

Phillip W. Stahlman  and
Stephen D. Miller
Phillip W. Stahlman
Affiliation:
Fort Hays Branch, Kansas Agric. Exp. Stn., Hays, KS 67601 and Dep. Plant, Soil, and Insect Sci., Univ. Wyoming, Laramie, WY 82071
Stephen D. Miller
Affiliation:
Fort Hays Branch, Kansas Agric. Exp. Stn., Hays, KS 67601 and Dep. Plant, Soil, and Insect Sci., Univ. Wyoming, Laramie, WY 82071
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Abstract

Densities up to 100 downy brome m2 were established in winter wheat in southeastern Wyoming and west-central Kansas to quantify wheat yield loss from downy brome interference and to approximate economic threshold levels. A quadratic equation best described wheat yield loss as a function of weed density when downy brome emerged within 14 days after wheat emergence. Densities of 24, 40, and 65 downy brome m2 reduced wheat yield by 10, 15, and 20%, respectively. Wheat yield was not reduced when downy brome emerged 21 or more days later than wheat. Economic thresholds varied with changes in downy brome density, cost of control, wheat price, and potential wheat yield. In a greenhouse experiment, dry weight of 72-day-old wheat plants grown in association with downy brome was not affected by the distance between the weeds and wheat, whereas downy brome plant dry weight increased with increasing distance between the weeds and wheat.

Keywords

Downy brome, Bromus tectorum L. ♯ BROTEwinter wheat, Triticum aestivum L.Competitionmodelingweed controlspace allocationBROTE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 38 , Issue 3 , May 1990 , pp. 224 - 228
Copyright
Copyright © 1990 by the Weed Science Society of America 

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