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Weed Treatment Methods

Your Property- Weed Inventory Assessment

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Treatment Conditions

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Spotted Knapweed

Houndstongue

Orange Hawkweed

Dalmatian Toadflax

Leafy Spurge

Whitetop

Sulfur cinquefoil

Common Tansy

Additional State Listed Noxious Weeds

Dalmatian toadflax

Dalmatian Toadflax

(Linaria dalmatica)

Family: Scrophulariaceae (figwort family)

Life cycle: Perennial

Roots: Deep, extensive root system

Leaves are cordate (heart-shaped), very waxy and clasp the stem

Flowers are snap-dragon form and each plant can produce 300,000 to 500,000 seeds per/year

Note: Yellow toadflax (Linaria vulgaris) has similar flowers and root structure but leaves are more narrow and lanceolate shape.  Growth patterns also differ.  Effective treatments are similar.

yellow toadflax

Yellow toadflax

Effective Control Methods

Mechanical:  Hand pulling very small patches has been known to work.  Start pulling early in the season and make sure to get as much of the root as possible.  This method could take many years.

Chemical – Herbicides such as Tordon 22K (Picloram) and Telar (Chlorsulfuron) work very well with a surfactant to penetrate the waxy cuticle.  Treatment time is best in the beginning stages of flower but this weed can be treated with herbicides that have a high residual all year.

Bio-Controls:  Mecinus janthinus is a stem boring weevil that works very well to control Dalmatian toadflax infestations.  Contact Weedbusters at www.weedbustersbiocontrol.com

Photos: USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood. org

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