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Search Results for ' Senecio jacobaea'

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Keywords: caterpillars, Senecio jacobaea, Biological control, Noxious weeds--Washington, Weed control--Pacific Northwest

PAL Question:

I was just walking through a wild area in Seattle with lots of weeds, and came across some strange caterpillars. They are mostly hairless (to the naked eye, anyway), and are striped black over orange with black legs. Can you tell me what they are?

View Answer:

I believe you may have seen the Cinnabar moth caterpillar, Tyria jacobaeae, which was introduced to the United States to control a noxious weed, tansy ragwort (Senecio jacobaea). Here are pictures to compare, and more information:
Wikipedia
Flickr image

Both Washington State's noxious weed control board and King County Noxious Weeds have information on weed control with Cinnabar caterpillars. (See page 5 of the document). Tansy ragwort is a Class B noxious weed, and control is required in King County.

Season All Season
Date 2009-07-16
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June 24 2013 12:55:25