Biological control in the Boundary

Mogulones crucifer

Controls hound's tongue.  Small round chew holes in the leaves are a sign that the insects are present.

Mecinus janthiniformis

Controls dalmatian and yellow toadflax.  Eggs are laid in cavities chewed into the shoots.

Aceria malherbae

Controls field bindweed.  Mites produce galls that causes the leaves to curl.

Cyphocleonus achates

Controls spotted and diffuse knapweed.  Larvae develop in the root.

Chrysolina spp.

Controls St. John's wort.  Adults feed on leaves and flowers.  They are a metallic bronze-green colour.

Aphthona flava

Controls leafy spurge.  Larvae feed on the roots and the adults feed on the leaves of the plant.

Larinus minutus

Controls spotted and diffuse knapweed.  Larvae develop in the flower head and eat the seeds.

Larinus planus

Controls Canada thistle and nodding thistle.  Flower heads with larvae in them have small brown marks.

Agapeta zoegana

Controls spotted and diffuse knapweed.  Larvae mine the root which stresses the plant.

For information on all the different bio agents
Larvae feeding on nodding thistle seed_
Larvae feeding on nodding thistle seed_

Oviposition marks on nodding thistle.
Oviposition marks on nodding thistle.

The brown dots indicate where the insects have laid their eggs.

Larinus Obtusus on a Diffuse Knapweed
Larinus Obtusus on a Diffuse Knapweed

Larvae feeding on nodding thistle seed_
Larvae feeding on nodding thistle seed_

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The insects are working!  Check out the before and after photos.

Hound's tongue

Canada Thistle 

Diffuse knapweed

Spotted knapweed

Leafy spurge

St. John's Wort

Dalmatian toadflax GF

Dalmatian toadflax 2012

How to tell if bio insects are present