Knapweed Root Weevil
Our newest insect for the knapweeds is the Knapweed Root Weevil, Cyphocleonus achates. This large weevil lays approximately 100 eggs at the base of older/larger spotted and diffuse knapweed plants. The developing larvae mine the central taproot, damaging the weed's vascular tissue and cause root-gall formation. This root-boring beetle is doing a dramatic job against spotted knapweed. Don't wait another year, get to the root of your knapweed! $100./carton of 105 root weevils.
Another bio-control of spotted knapweed is the Blunt Knapweed
Flower Weevil, Larinus obtusus. This beetle will establish itself
readily and spread quickly through your knapweed. We've seen noticeable
declines in knapweed seed production and increased plant stress
due to this new insect.
Blunt Knapweed Flower Weevil
Pre-order your weevils now for July 2018 delivery!
$75./carton of 210 adult flower weevils.
Our third insect against spotted and diffuse knapweeds is the
Lesser Flowerhead Weevil, Larinus minutus. This long-lived beetle lays its eggs throughout the summer on
the flowers of both diffuse and spotted knapweeds. Like the other
flower attacking agents, this species contributes greatly to reducing
the production of new knapweed seed.
Both of the Knapweed Flowerhead Weevils are winter cold hardy and yet thrive
in hot, dry summer knapweed environments. If you have spotted
or diffuse knapweed, you should get some of these beetles released
this year. Both the Blunt and Lesser Knapweed Weevils are compatible
in your knapweed infestations. Cartons of 210 adults are $75.00.
Lesser Knapweed Flowerhead Weevil damage (left) and adults.
Click here for more knapweed information...
Biological Control of Weeds, Inc.
1418 Maple Drive Bozeman, MT 59715