Pull as much of the vine away from the tree as possible. Mowing has little effect unless mowing is repeated frequently. Grazing animals will only keep poison oak or ivy at bay if it is continued consistently for several years, he said. Another option is spraying with herbicides. Spray only according to label directions on a calm day.
Herbicides can damage valuable plants such as ornamentals, so use care.
Follow washing by liberally applying rubbing alcohol or a solution of alcohol and water in equal proportions to dissolve all the unabsorbed poison. Contaminated clothing can carry the poisonous oil for years. Poisoning may occur even after laundering - with extreme sensitivity, dry cleaning of clothing is recommended. Do not wash contaminated clothing with other clothing. Take care to rinse out the washing machine thoroughly after laundering contaminated clothing.