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Ecological Characteristics of Three Winter Annual Grasses

Published online by Cambridge University Press:  12 June 2017

R. L. Anderson
R. L. Anderson*
Affiliation:
Central Great Plains Research Station, Akron, CO 80720
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Abstract

Producers rely on cultural practices to manage downy brome, jointed goatgrass, and feral rye in winter wheat because there are no effective herbicides for in-crop control. This study characterized seedling emergence, growth, and development of these winter annual grasses, with the goal of suggesting or improving cultural control strategies. Feral rye seedlings emerged within 4 wk, whereas downy brome and jointed goatgrass seedlings emerged over a 10-wk period. Emergence patterns of these grasses suggest that delay of winter wheat planting may be effective in reducing feral rye densities, but this strategy most likely will be ineffective with downy brome or jointed goatgrass. Downy brome began anthesis 1 to 2 wk earlier than the other two grasses and winter wheat. Both downy brome and jointed goatgrass were shorter than winter wheat during the growing season, whereas feral rye was at least as tall as wheat. Producers mow infested wheat to prevent weed seed production, but this practice may not be effective with jointed goatgrass and downy brome because of their short stature and downy brome's earlier development. Conversely, mowing has potential in preventing feral rye seed production. The grasses produced between 340 and 770 seeds/ plant.

Keywords

Downy brome, Bromus tectorum L. # BROTEferal rye, Secale spp.jointed goatgrass, Aegilops cylindrica Host # AEGCYwinter wheat, Triticum aestivum L. ‘TAM 107.'Cultural practicesplant developmentseedling emergenceAEGCYBROTEGDD, growing degree day
Type
Research
Information
Weed Technology , Volume 12 , Issue 3 , September 1998 , pp. 478 - 483
Copyright
Copyright © 1998 by the Weed Science Society of America 

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