Canada Thistle Bud Weevil  (three photos)
Larinus planus

Thistle head weevil
These pretty weevils, who initially helped to control invasive thistle by feeding on them,
are established on Antelope Island. They are an introduced species. Carol Davis, 6-22-2010

green bug
According to Wikipedia, Larinus planus may have had an impact on reducing Wavyleaf Thistle
in the West, although I haven't seen much of a shortage myself.  Carol Davis 6-22-2010

canada thistle bud weevil
Because this little weevil now attacks native thistle as well as the invasive species, it is no
longer recommend for use as a biological control agent, according to the information
 I found at Washington State University.  Carol Davis 6-8-2009

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