Report #33 - Report: Garlic Mustard (Alliaria petiolata)

Garlic Mustard (Alliaria petiolata) on Apr 25, 2008

Submitter has sample

Description of specimen

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GARLIC MUSTARD

Second-year plants about 8"tall. Horseshoe shaped leaves. Small white flowers.
First-year plants. Billions and billions of seedlings. 1-3" tall at this time.

Commentary

Is there any help available to help eradicate it? If the county would spray now, while it is largely confined to the edges of the road, we might be able to stem the tide. It is moving through the woods like a tidal wave!

Reporter
April 25, 2008, 12:17 p.m.

Hello! Thanks for reporting garlic mustard. Unfortunately it is widespread in the Portland area. I will forward your report to the local Cooperative Weed Management Area (4-County CWMA) so they can identify who may be able to take the lead for the particular infestation you reported. You may want to contact your local SWCD (www.emswcd.org or http://westmultconserv.org/swcd/) to find out about any active GM control projects happening and see if this invasion can be incorporated into their efforts, as well. Another option may be to mobilize local land owners to cooperate to control the species in that area. Good luck, and thanks again for your report.

Tania Siemens
Oregon Sea Grant Extension

Tania Siemens
April 30, 2008, 2:32 a.m.

Location

Shoulder and about 50' downhill from shoulder of NW and SW Skyline Blvd.
Some areas where there is a homeowner has sprayed, there isn't any. Most areas have absentee owners, the land is undeveloped or under development, and the Garlic Mustard is moving rapidly into these areas. Willamette Stone State park is infested now and the weed seed evidently have been tracked in by foot further into the woods.

Scrub, edge effect: mixed grass, mixed weeds, bigleaf maple, some hemlocks, cedars, Doug Fir, Grand Fir, holly, various blackberries, snowberry, ENGLISH IVY, wild geranium, some natives, such as ferns, trillium, snow berry, etc.

Garlic Mustard (Alliaria petiolata) on Apr 25, 2008

Description of specimen

Commentary

Remedy

Resources

Location

Expert Reviewer