Land Plants - invasive

Tansy Ragwort (Senecio jacobaea) on Jul 5, 2008

Submitter does not have a specimen

Description of specimen

Several tansy ragwort plants. Yellow blooms and buds. Wrinkled leaves. About three feet tall. Lots of small and large yellow and black banded Cinnabar larvae on them. The land owner/developer is just starting to mow the fields south of the developed area on the south side of the new Woodscape Park. Grass north of the new Woodscape Park is now about 5 feet tall.

Commentary

No. We did see adult Cinnabar moths in the area.

Reporter
July 5, 2008, 8:31 a.m.

Thank you for your report! As you may be aware tansy ragwort is common in western Oregon. As you have noted that biological controls are present. There are two primary bio-agents for tansy one you noted; the cinnabar moth and the other is the tansy ragwort flea beetle. This two agents keep tansy populations below an economic level through out western Oregon.

If you travel to central and eastern and see tansy please submit a report, tansy is a high priority for control east of the Cascades.

Tim Butler, ODA Noxious Weed Control Program.

Tim Butler
July 15, 2008, 1:52 p.m.

Remedy

King County Tansy Ragwort Control Guide

Location

Adjacent to and on the north side of Woodscape Park, in Salem. Roughly straight west from Eastlake Dr SE where it meets Battle Creek Rd. The plants are on the east side of the line of small oak trees which are on the west side of the field.

There are more plants along the sidewalk between the south end of Bellflower Ct SE and the undeveloped fields to the south, near Pringle Elementary school.

Expert Reviewer

Mr. Tim Butler

© 2025 Portland State University | Contact us for questions regarding site content