Diana I would not know poison ivy, don't think I ever saw it. Sumac, I know what it looks like. I'm not putting anyone down for doing what they want. I just don't want to use the poisons. But I prolly would with some things like "Giant Hogweed". Oh, and son who is in his mid 30's has managed to find his way into poison ivy 3 times. He got into some uncomfortable places... Love him, but he was the same kid that took hot food out of the oven and right into his mouth...did not understand why the food was hot....