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The release and recovery of Bradyrrhoa gilveolella on rush skeletonweed in southern Idaho


Littlefield, J. L.; Markin, G.; Kashefi, J.; de Meij, A.; Runyon, J. 2013. The release and recovery of Bradyrrhoa gilveolella on rush skeletonweed in southern Idaho. In: Wu, Yun; Johnson, Tracy; Sing, Sharlene; Raghu, S.; Wheeler, Greg; Pratt, Paul; Warner, Keith; Center, Ted; Goolsby, John; Reardon, Richard, eds. Proceedings of the XIII International Symposium on Biological Control of Weeds; September 11-16, 2011; Waikoloa, Hawaii, USA. Session 9: Post-release Evaluation and Management. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Forest Health Technology Enterprise Team. Online: http://www.invasive.org/proceedings/pdfs/Littlefield%20-%20Markin.pdf

Rush skeletonweed (Chondrilla juncea L.) is a major noxious weed in Idaho and other areas of the Pacific Northwest. A biological control program was implemented during the late 1970s in an attempt to manage infestations of rush skeletonweed and to limit its spread into new areas. Three agents, Cystiphora schmidti (Rübsaamen) (a gall midge), Aceria chondrillae (Canestrini) (a gall mite), and Puccinia chondrillina Bubak & Sydenham (a rust fungus) have been established in Idaho and other areas of the western United States. However these agents have provided only limited control of the weed. One additional agent, the root-feeding moth Bradyrrhoa gilveolella (Treitschke) (Lepidoptera, Pyralidae), was approved by the USDA-APHIS for release in the United States in 2002. Initial releases were made in southern Idaho in November 2002 and during the summers of 2003 through 2009 (excluding 2005). Releases were made using infested plants (the 2002 initial release) then utilizing first instar larvae and adults from greenhouse colonies. In total we released the moth at eight sites utilizing nine infested plants (est. 27 larvae), 6,095 larvae, and 60 adults. At several sites, releases were made in multiple years. Sites were periodically monitored for evidence of establishment (presence of adults or larval feeding tubes) during the summer or early autumn.

Keywords: rush skeletonweed, Chondrilla juncea, noxious weed


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Title: RMRS Other Publications: The release and recovery of Bradyrrhoa gilveolella on rush skeletonweed in southern Idaho
Electronic Publish Date: September 25, 2013
Last Update:
September 25, 2013

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