You are here

Keyword: Centaurea maculosa

Biological control agents elevate hantavirus by subsidizing deer mouse populations

Publications Posted on: December 14, 2015
Biological control of exotic invasive plants using exotic insects is practiced under the assumption that biological control agents are safe if they do not directly attack non-target species.

Effects of herbicide treatment on invasive knapweed and other grassland plants

Science Spotlights Posted on: August 21, 2015
Invasive plants such as spotted knapweed (Centaurea maculosa) have overrun vast areas of the United States to the detriment of native plants and wildlife. Managers increasingly use broadleaf herbicides to suppress plant invaders, assuming that suppression will relieve the impacts of invasion. Rocky Mountain Research Station scientists evaluated the effects of a common herbicide treatment on grassland plants in western Montana to determine if and when suppression of spotted knapweed may relieve impacts of this notorious invader.

Effects of biological control agents and exotic plant invasion on deer mouse populations

Publications Posted on: April 21, 2015
Exotic insects are commonly introduced as biological control agents to reduce densities of invasive exotic plants. Although current biocontrol programs for weeds take precautions to minimize ecological risks, little attention is paid to the potential nontarget effects of introduced food subsidies on native consumers. Previous research demonstrated that two gall flies (Urophora affinis and U.

Population-level compensation impedes biological control of an invasive forb and indirect release of a native grass

Publications Posted on: May 30, 2012
The intentional introduction of specialist insect herbivores for biological control of exotic weeds provides ideal but understudied systems for evaluating important ecological concepts related to top-down control, plant compensatory responses, indirect effects, and the influence of environmental context on these processes.

Biotic resistance via granivory: Establishment by invasive, naturalized, and native asters reflects generalist preference

Publications Posted on: March 20, 2012
Escape from specialist natural enemies is frequently invoked to explain exotic plant invasions, but little attention has been paid to how generalist consumers in the recipient range may influence invasion.

Long-term effects of weed control with picloram along a gradient of spotted knapweed invasion

Publications Posted on: March 29, 2011
Broadleaf herbicides are commonly used in rangelands to suppress exotic weeds and release native communities from negative impacts of invasion.

Catechin-metal interactions as a mechanism for conditional allelopathy by the invasive plant, Centaurea maculosa

Publications Posted on: December 04, 2009
Considering variation, or conditionality, in the ways that plants compete for resources, facilitate or indirectly interact with each other has been crucial for understanding the relative importance of these interactions in the organization of plant communities (Tilman 1985; Wilson & Keddy 1986; Kitzberger, Steinaker & Veblen 2000; Levine 2000; Brooker et al. 2005; Baumeister & Callaway 2006).

Factors influencing plant invasiveness

Publications Posted on: December 02, 2009
Invasiveness of spotted knapweed and biological control agents. Dean and Yvette are examining the influence of drought on the invasiveness of spotted knapweed (Centaurea maculosa) and its susceptibility to herbivory by biological control agents. In collaboration with the University of Montana and Forest Health Protection, researchers have constructed 150 experimental plots.

Comparison of ground beetle (Coleoptera: Carabidae) assemblages in Rocky Mountain savannas invaded and un-invaded by an exotic forb, spotted knapweed

Publications Posted on: November 30, 2009
We compared ground beetle (Carabidae) assemblages between spotted knapweed (Centaurea maculosa Lam.) -invaded (invaded) and un-invaded (native) habitats in Rocky Mountain savannas. Carabids play important roles in biotic communities and are known as a good indictor group of environmental change.

Root exudate is allelopathic in invaded community but not in native community: Field evidence for the novel weapons hypothesis

Publications Posted on: November 12, 2009
Invasion by exotic species threatens natural ecosystems (Wilcove et al. 1998) and has severe economic ramifications (Pimentel et al. 2000). In many cases, exotic species that form near monocultures in their invaded range are much rarer in their native communities (Lonsdale & Segura 1987; Braithwaite et al. 1989; Malecki et al. 1993; Eckert et al. 1996; Meyer & Florence 1996; Bruce et al. 1997; Paynter et al. 1998; Memmott et al.

Pages