|I have poison ivy or oak wrapped around 2 cedar elm trees trunks aprox 5|
To kill the vines growing up the trees, cut the ?trunk? of the vines in a couple of places near where the vines emerge from the soil to remove a section of vine. This will kill everything upward from that point. You can "paint" the cut stump of the vine with a strong solution of a product for killing poison ivy or brush containing ingredients such as triclopyr or glyphosate. If you don't treat the fresh cut stump another option is to spray the leafy resprouts and the smaller vines throughout the area with one of the above products at the strongest label rate. This will knock it back well but some will resprout. When it gets a few leaflets out spay it again. These herbicides are translocated into the roots and kills smaller vines while severely damaging stronger ones. Repeat applications will eventually get them all. Later summer to early fall is a good time to make a final application as the vines are storing sugars for the dormant season ahead. Herbicide applications seem to be more effective at that time.
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