Hello,

Poison ivy is one of the most common causes of blistering dermatitis in the Midwest and Northeast regions of the country. If you will try and control poison ivy with herbicide applications, then August is the time to start. Cool nights trigger the vines to start storing energy for next year’s campaign. Soon, the leaves will turn crimson red and fall to the ground. Therefore, the first herbicide application must be made before the end of August to get good translocation into the vine and root system. Herbicides containing 2,4-D and triclopyr are the most effective on poison ivy. Extra caution should be used to avoid applying these products to adjacent broadleaf vegetation

Please perform the following

Check your herbicide and find out if it contains: 2,4-D and triclopyr – READ THE LABEL on the container – Look for the active ingredients on the label. If the Bio-Advanced Brush Killer DOESN'T have 2,4-D and triclopyr, YOU HAVE the wrong herbicide

Do not spray on a windy day.

If you spray, put a barrier (two sheets of heavy-duty cardboard) between the pine and poison ivy.

You might have to pull the vine away from the pine if you do this. WEAR GLOVES!

Two applications, three weeks apart, should provide a substantial reduction in returning plants next spring. Spot treating may be necessary in late April or early May to remove persistent plants. The irritating oil of poison ivy is present in all plant parts and will persist in dead vegetation for over a year. Take precautions when handling any plant parts or clothing that has come into contact with the vines. The above information is at this link:

Poison ivy control - MSU Extension

Other references:

Poison Ivy in Michigan – Toxicodendron radicans and rybergii - Plant & Pest Diagnostics (msu.edu)

Poison Ivy in Michigan - Plant & Pest Diagnostics (msu.edu)

Poison ivy: Frequently Asked Questions - MSU Extension

I hope this helps!