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Poison ivy Rhus radicans L. aka Rhus toxicodendren Sumac Family Key identifying traits Leaves are alternate, compound in groups of three, somewhat shiny and often drooping Flowers are small and yellowish-green; bloom time is generally in May and June The inconspicuous flowers are composed of 5 sepals, 5 petals , 5 stamens and a single pistil Fruit is a globe-shaped, creamy-white, waxy berry; each pod has one round, white & gray striped seed Leaves turn bright red in the fall “Leaves of three, let them be” Biology and ecology It is a perennial native of North America Reproduces by seed, rhizomes, and rooting of the stem nodes; birds eat the berries and spread seed Can grow as either a shrub or a climbing vine It thrives under a wide variety of conditions Contact with the plant can cause severe itching; skin becomes red and blistered within 24 hours Toxic properties and rhizomes make control difficult Often confused with Poison Oak, a similar species usually found on the west side of the state immature fruit Control Prevention – Learn to identify plants; know your property; don’t let birds fly over your property Biological – No known biological agents yet Cultural – Good vegetative cover helps but does not prevent establishment or spread Mechanical – Cutting will not achieve control due to the underground root system; burning is dangerous as it releases the toxins into the air; repeated cultivation can be effective Chemical – Several effective but may require repeat treatments; timing depends on chemical used Photo courtesy Agriculture & Agri-Food of Canada Where found – Found in many locations throughout Stevens County, close to water bodies such as lakes and scattered along the Columbia River. Also along many railroad rights-of-way. Stevens County Noxious Weed Control Board, January 2006