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Re: biological control of thistle

Might be something in the APHIS invasives pages..
(APHIS - Animal and Plant Health Inspection Service)
http://www.aphis.usda.gov/oa/invasive/invasive.html

Hope Cassida rubiginosa isn't fond of native thistle
Karolyn 

----- Original Message ----- 
From: "J. A. Raasch" <jaraasch@wiscmail.wisc.edu>
To: "prairie list" <prairie@mallorn.com>
Sent: Wednesday, June 18, 2003 12:52 PM
Subject: biological control of thistle


> Hello.
> 
> Does anyone have experience with Thistle Defoliating Beetle, Cassida 
> rubiginosa, or other insects used for biological control of 
> thistles? Please tell me whether you have used such insects to 
> successfully reduce thistle density.
> 
> Oh... does anyone know whether  it is okay to use Thistle Defoliating 
> Beetles in Wisconsin?
> 
> Thanks.
> 
> John Raasch
> Mount Horeb, WI
> 
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