- Leafy Spurge
- Knapweeds
- St. Johnswort
- Yellow Starthistle
- Musk Thistle
- Canada Thistle
- Tansy Ragwort
- Toadflax
- Poison Hemlock
- Purple Loosestrife
- Educational Materials
(insect photographs)
Yellow and Dalmatian Toadflax Insects

Toadflax Stem-Boring Weevil Damage and Adult Mecinus janthiniformis
BCW's newest insect against Dalmatian toadflax is making a BIG impact. Mecinus janthiniformis, the Toadflax Stem-Boring Weevil is a 4-5mm long weevil that severely damages the flowering and reproduction of toadflax. Adult weevils feed externally on the foliage and the larvae feed within the plant. Larval feeding damages the weed's vascular tissues, reduces flowering and causes conspicuous wilting of attacked shoots. Adult feeding on the outside of the plant further damages the weed's ability to reproduce.

Report after report describes this insect causing Dalmatian toadflax infestations to "crash" in the field! Releases of 105 adult weevils are $100.00 and are shipped in May.

2018 Mecinus Special Offer: Order 3 cartons & get a 4th carton free!

Get the upper hand on toadflax: Order your own Mecinus for this summer!

Toadflax Seed Weevil
Gymnetron antirrhini

The Toadflax Seed Weevil, Gymnetron antirrhini, causes substantial damage to the seed producing ability of toadflax. Shoots and flowers are fed upon by the adults and the larvae feed on the developing seed capsules. Both adult and larval feeding can reduce seed production by 85 - 90%.

We offer cartons of 105 adult weevils in July (their mating and egg laying period) for $75.00.

Biological Control of Weeds, Inc.
1418 Maple Drive • Bozeman, MT 59715
Phone 406-586-5111

Email: bugs@bio-control.com