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