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until early May, when the thistle starts forming a flower head. The female lays 150 to 200 eggs protected by a mud daub covering on the underside of the plant. The eggs hatch as larva in early June and burrow into the center of the thistle, feeding on the seed tips. Once the tips are devoured, the seeds are unable to germinate and the plant dies without spreading.
The weevils will never eat all the thistles in Warren County. DeOms explained that “stability,” not complete eradication, is the goal of a biological control program. The incidence of thistles will continue to decrease, while the weevil population increases, until there are only pockets of thistles left. Then the number of weevils will also decrease in response to the limited food supply necessary to support the weevil’s life cycle. Using the weevil as a control has met with the greatest success to date in Pulaski County, where a 95 percent control of thistle growth was achieved on a thousaid acre project, according to DeOms.
96.5%