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“Acceptable” Levels of Spotted Knapweed (Centaurea maculosa) Control

Published online by Cambridge University Press:  12 June 2017

Roger L. Sheley  and
James S. Jacobs
Roger L. Sheley
Affiliation:
Plant, Soil and Environmental Sciences, Montana State University, Bozeman, MT 59717-3120
James S. Jacobs
Affiliation:
Plant, Soil and Environmental Sciences, Montana State University, Bozeman, MT 59717-3120
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Abstract

Competition between bluebunch wheatgrass and spotted knapweed was quantified using three addition series experiments in an environmental chamber. Using two density matrices, spotted knapweed plants were thinned by either 45 or 90% of their original densities 40 d after emergence. Another matrix of density combinations was not thinned. All plant material was harvested 90 d after thinning. Spotted knapweed was about four times more competitive than bluebunch wheatgrass. Reducing spotted knapweed by 45% did not alter the competitive relationship between the two species. We believe remaining knapweed individuals captured the majority of the newly available resources. Ninety percent reduction was necessary to shift the competitive relationship in favor of bluebunch wheatgrass. Successful integrated spotted knapweed management must exploit key mechanisms and processes directing plant community dynamics, in conjunction with weed density reduction, if communities are to be shifted toward those that are desired.

Keywords

Spotted knapweed, Centaurea maculosa Lam. # CENMAbluebunch wheatgrass, Agropyron spicatum (Pursh.) Scribn. and SmithAddition seriescompetitive relationshipsdensity reductionCENMA
Type
Research
Information
Weed Technology , Volume 11 , Issue 2 , June 1997 , pp. 363 - 368
Copyright
Copyright © 1997 by the Weed Science Society of America 

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