Regularly patrol your property for tansy ragwort plants and immediately control or remove infestations before seed set. Longitarsus jacobaeae is a species of flea beetle known as the tansy ragwort flea beetle.It is used as an agent of biological pest control against the nectar-rich noxious weed known as ragwort (Senecio jacobaea).. The adult beetle is light golden brown in color and between 2 millimetres (0.079 in) and 4 millimetres (0.16 in) long. It contains toxins, which can have … It was one of the few plants regulated under the former county noxious weed control district that was formed in 1949. Common tansy (Tanacetum vulgare) can be difficult to control. But this year, tansy ragwort has flourished throughout western Oregon through a combination of weather conditions and a "down cycle" for the three insects used to Tansy ragwort grows to a short of height of about 3 foot tall, as where Common tansy grows up to 7 feet tall. Immediately re-vegetate disturbed, bare soils with a suitable seed mixture that provides dense, early colonization to prevent weed invasion. The need to control ragwort Common Ragwort (Senecio jacobaea) is a specified weed under the Weeds Act 1959.

CORVALLIS, Ore. - The near-eradication three decades ago of tansy ragwort, one of Oregon's most problematic invasive species, was considered a crowning achievement because of innovative biological control methods. Because tansy ragwort is a state-listed noxious weed, control (both manual and chemical) in critical areas is allowed as long as the landowner consults with the Jefferson County Noxious Weed Control Board and follows their guidelines. Tansy ragwort has a long history in Clackamas County. They both have yellow flowers but Tansy ragwort’s flowers have conspicuous petals with an orange center, where Common tansy’s flowers are in clusters on top of the stem. At that time, landowners in Clackamas County could be cited for having flowering plants on their property. Tansy ragwort a. plant, b. flower, c. rosette leaf, d. stem leaf (Rachel Winson, MIA Consulting, in Forest Health Technology Enterprise Team- Biology and Biological Control of Tansy Ragwort) Tansy ragwort seed head By Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Cooperate with adjacent landowners and encourage them to prevent tansy ragwort spread.