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Downy Brome (Bromus tectorum) Density and Relative Time of Emergence Affects Interference in Winter Wheat (Triticum aestivum)

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw
Robert E. Blackshaw*
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB, Canada T1J 4B1
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Abstract

Field experiments over 3 yr at Lethbridge, Alberta, determined the effect of various downy brome densities and times of its emergence on winter wheat biomass and seed yield. Downy brome reduced wheat biomass up to 59% and seed yield up to 68%. Time of downy brome emergence relative to wheat affected the magnitude of these yield reductions more than the density of downy brome. At comparable densities, downy brome caused 2- to 5-fold greater reductions in yield when it emerged within 3 wk after winter wheat than when it emerged 6 wk after wheat or in early spring. Late-emerging downy brome caused significant wheat yield or biomass losses only at densities of 200 to 400 plants m-2. Late-emerging downy brome plants were strongly shaded (70 to 90%) by winter wheat throughout much of the growing season.

Keywords

Downy brome, Bromus tectorum L. # BROTEwinter wheat, Triticum aestivum L. ‘Norstar’Competitionphotosynthetically active radiationweed biomasswheat biomasswheat yieldBROTE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 4 , December 1993 , pp. 551 - 556
Copyright
Copyright © 1994 by the Weed Science Society of America 

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