>I recommended they wait until this winter and cut every vine on the property, then >hit the new leaf buds with diesel as soon as they appear. Besides being a violation of Federal Law to use the diesel fuel, the stuff is incredibly toxic to the environment. If they're going to cut the poison ivy trunks, an application of triclopyr Brush B Gone ) to the cut stumps is very effective. I have found that Round Up can be quite effective on mature poison ivy stands *If the ivy is actively growing and not drought stressed. Application a day or two following a rain when the new leaves are emerging works very well. Using a liquid fertilizer like MiracleGro a day or so before application can help, too. Daryl