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The Mission of the Yellowstone County Weed Department is to assist the public, private, and other government agencies to manage and control existing noxious weed infestations as well as to prevent new invasive species from infesting Yellowstone County.
Tansy RagwortSenecio jacobea L.
Photo from Weeds of the West, revised edition
Photos from Montana Weed Control Association
Video Supplied By Montana Weed Control Association
| Attribute | Description |
|---|---|
| Toxic | Toxic. All livestock, most especially cattle and horses. |
| Growth Habit | Biennial or short-lived perennial, 1 to 6 feet tall, solitary or several. |
| Leaves | Leaves are 2 to 8 inches long, alternate and equally distributed, mostly 2 to 3 times pinnately lobed, the terminal lobe generally larger than the lateral ones. |
| Stem | 1 to 6 feet tall, solitary or several. |
| Flower | Flowering heads are numerous, both ray and disk flowers are yellow; ray flowers are 10 to 13 in number and ¼ to ½ inch long. |
| Roots | Taproot. |
| Seeds | Minutely pubescent. |
| Reproduction | By seed. |
| Habitat | Range and pasturelands. |
| Biological Control | Cinnabar Moth, Ragwort Seed Fly, Tansy Ragwort Flea Beetle. |
| Herbicide | 2,4-D, or 2,4-D + dicamba, or 2,4-D + trichlopyr. |
| Caution | Tansy Ragwort is toxic to cattle, horses, sheep, humans and pets. |