Biological Weed Control Before & After Photos

A site near Corvallis, MT where Cyphocleonus weevils were introduced to control spotted knapweed.  Photo by Jim Story, 1991.
This is the same site in 1998.  Note the decrease in spotted knapweed density/health.  Photo by Jim Story.

A Cyphocleonus release site near Basin, MT in 2000 about 5 years after first release.  Note how the stand of large knapweed plants is already starting to break up and die.  Photo by Ron Gibson.
The same site in 2005.  Note the lack of large mature plants and how the native grasses are coming back as the weevils slowly kill the large knapweed plants.  Photo by Todd Breitenfeldt.
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