If large quantities of the poison is left on the skin, it turns black, resembling black enamel paint. It is not possible to spread the poison ivy from the blister fluid. This has been tried many times without success. The rash may appear later because of the slow absorption into the skin or because of re-exposure. Poison ivy is not contagious but can be spread if poisonous sap persists on the hands, clothing or a backyard pet.
Herbicides are effective in eradicating the poison ivy plant.
Roundup, if properly applied, will kill poison ivy with one application. The concentrations are very important, so be sure to read the directions. The best protection from poison ivy is the ability to recognize the plant. The three-leafed, spiked, green plant with a red stem is found in Arkansas and the southern states. Upon first exposure, washing with soap and water is helpful if done within the first few minutes to half an hour.