The defoliating Klamath Weed Beetle, Chrysolina quadrigemina, feeds on the foliage of this weed in both the adult and larval stages. The Klamath Weed Beetle has dramatically reduced the abundance and density of this weed in areas where fall temperatures are mild. This biological control agent is responsible for contributing to the impressive decline in St. Johnswort in the Pacific states. Releases of 105 adults are available during June and July for $75.00.
Aplocera plagiata, the St. Johnswort Inchworm, lays about 300 eggs onto the leaves of this poisonous perennial weed. The larvae that hatch from these eggs go on to defoliate the plant. Two generations often occur with this species able to withstand high and low temperature extremes and dry habitats. Releases of 105 larvae are available in September for $75.00.
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Biological Control of Weeds, Inc.
1418 Maple Drive Bozeman, MT 59715
Phone 406-586-5111 FAX: 406-586-1679