Fortunately, we don't have poison ivy in Britain. I use a propane flame-gun against weeds, although it needs multiple applications for deep-rooted ones. I've not before thought to try this but, during my long professional interest in coastal oil pollution, it has been apparent that a single light coating with crude or oil products will kill most vegetation (but, notably, umbellifers are so resistant that a spray of light oil has been used to kill weeds in a carrot patch). For spot weeding, why not use a light penetrating oil - a WD40 spray might seem ideal. Tony N-S.
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