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Diffuse and Spotted Knapweed Bioagents
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Larinus minutus
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Cyphocleonus achates
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This weevil attacks knapweed seed
heads, feeding on the actual seeds. A single larva can destroy an
entire diffuse knapweed seed head.
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This large weevil prefers spotted
knapweed, but will attack diffuse knapweed. The larva mines down
into the root and feeds on the root reserves.
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Sphenoptera jugoslavica
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This beetle prefers diffuse knapweed,
but will attack spotted knapweed. The larva mines down into the
root and feeds on the root reserves. Feeding stops rosette growth.
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