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Poison Ivy

Poison Ivy. Wyandotte County Kansas State Research & Extension. Poison Ivy. Most common allergy in the country affecting about 66% of population Sensitivity to poison ivy (urushiol) can develop at any time First published reports of poison ivy date back to the 1600’s.

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Poison Ivy

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  1. Poison Ivy Wyandotte County Kansas State Research & Extension

  2. Poison Ivy • Most common allergy in the country affecting about 66% of population • Sensitivity to poison ivy (urushiol) can develop at any time • First published reports of poison ivy date back to the 1600’s. • 500 people could itch from the amount of oil covering the head of a pin • 1-5 years is normal for urushiol to stay active on any surface including dead plants.

  3. Poison Ivy Leaflets 3, let it be! • compound leaf made up of 3 • leaflets (1-4” long) • center leaflet on a longer stalk • leaves alternate on the stem • edges of leaflets are often • smooth, but can be toothed or • lobed. • leaflets may be different shades • of green; glossy or dull finish • scarlet red fall color

  4. Poison Ivy • Scientific classification: • Anacardiaceae – Cashew family • Rhus radicans or Toxicondendron radicans • Native woody plant found throughout Kansas • Woody shrub, groundcover, or vine (hairy aerial roots) • Yellowish-green flowers in May producing the waxy, • grayish-white berry-like fruit

  5. Poison Ivy • All parts of poison ivy, including • the roots, are poisonous at all times • of the year. • Easily spread by birds that feed on • the berries • Small mammals & deer browse on • the poison ivy foliage, twigs & berries

  6. Poison Ivy • Irritating Plant: • Toxin in poison ivy is an oil (urushiol) • Contact with the oil is necessary. • Once a leaf, stem or any plant part is bruised, • broken, cut, etc. the sap becomes exposed. • Oil can also be carried in the smoke from • burning poison ivy. • Oil can remain active on tools, clothing, gloves • for up to a year. • Oil can be transmitted on pet fur, as well.

  7. Poison Ivy • Avoidance is the best approach • If exposed, wash with soap and cold water immediately! • Results in an irritating skin reaction – itchy rash with clear blisters • Rash can appear within 24-36 hours or in 7-10 days. • New lesions that appear a few days after the primary lesions represent less sensitive areas or areas where less oil was deposited. NOT SPREAD BY OOZING BLISTERS!!

  8. Common Look Alikes • Virginia creeper • 5 palmate-like leaflets • blueblack berries • trailing or climbing vine

  9. Common Look Alikes Boxelder seedlings • 3 to 5 divided leaves • Leaflets pinnate like a feather • Leaves opposite on the stem • Erect tree

  10. Common Look Alikes • Poison oak and poison sumac are not found in Kansas! • Poison oak is found only in a few counties in extreme southern Missouri.

  11. Poison Ivy Control • Grubbing or hand pulling (wear rubber gloves) • Sever the main vine and remove. Treat stump immediately or treat new, emerging shoots with a herbicide to control the roots • Treat the foliage with an herbicide; painting individual leaflets to avoid contacting desirable plants.

  12. Poison Ivy Herbicides: • Glyphosate – Roundup • Triclopyr • 2,4-D and Dicamba (Banvel) Best treated May through July Wait 3-4 weeks for the product to work before applying any additional herbicide Always read and follow label directions!

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