how to identify and eliminate poisonous sumac and purple
Thank you for the question. The best way to control poison sumac is with an herbicide that is a full spectrum herbicide containing glyphosphate, and or tryciclopyr and/or a combination of these two chemicals. Read the package label completely before using. You will have to be persistent and it may take a few years to rid yourself of it. Here is a good publication on how to identify this plant: http://www.poison-ivy.org/poison-sumac and another one that discusses control and the important things to do and not to do in order to protect yourself while dealing with it: http://www.aces.edu/pubs/docs/A/ANR-1460/ANR-1460.pdf.
Be aware that poison sumac is quite rare in Minnesota.
Here is our publication on and elimination of bitter nightshade, a common climbing nightshade with small purple climbing flowers: https://www.extension.umn.edu/garden/yard-garden/weeds/bitter-nightshade/ This plant is mildly poisonous, especially the green berries and is especially toxic to small children due to their low body weight.
Thank you for contacting Extension.