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Spotted knapweed: Effects of climate change on the invasiveness and biological control

Posted date: October 01, 2013
Publication Year: 
2013
Publication Series: 
Miscellaneous
Source: In: Fornwalt, Paula. Invasive Species Science Update (No. 6). Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 4.

Abstract

Exotic weeds have invaded vast stretches of forest and rangeland, yet as highlighted by the previous review by Runyon and others in this issue, little is known about the factors driving the success of these invaders or how factors such as climate change may alter outcomes. Spotted knapweed (Centaurea stoebe) is one of the worst weeds in the Western U.S., infesting over seven million acres. Even so, knapweed populations declined in Western Montana in the early 2000s, coincident with severe drought. Furthermore, the biocontrol agent, the knapweed root weevil (Cyphocleonus achates), was established at some of the sites where strong declines in knapweed occurred, suggesting that this weevil could have a role in suppressing the notorious invader under conditions of drought stress.

Citation

Ortega, Yvette; Pearson, Dean. 2013. Spotted knapweed: Effects of climate change on the invasiveness and biological control. In: Fornwalt, Paula. Invasive Species Science Update (No. 6). Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 4.