I have to agree with @bennfun on this. We have a lot of poison ivy both here in Michigan, and at my brother's house in Ohio, and the leaves are very much green except in the fall and winter, or if the summer weather is especially hot and dry, such as we had a few weeks ago. As soon as it cooled down a little and we got some rain, the leaves turned back to bright green again.
I used to do tree work for a living, and I have seen individual vines as big as my arm. On one occasion, I had the unpleasant task of cutting down a poison ivy "plant" with over 40 large vines stemming from a trunk nearly six inches in diameter! Some of the leaves were almost as big as my hand! Despite all my precautions, I still ended up with a rash on most of both arms and on my face, and lost three days of work as a result. One of our other workers foolishly climbed a tree that had several vines on it, and he wound up in the emergency room the next day with a rash covering over 50% of his body.
It is also important to bear in mind that the oil from the plants can remain active for up to two years on other surfaces that it does not bond with (such as shoes, gloves, and tools), and the oil on the plants themselves remains active for the same period even if the plants have been killed. So even after using an herbicide to kill them, you must take just as much care to avoid contact with the plants.
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