Poison Ivy (Toxicodendron radicans). The hairy vine clinging to the tree is one form of poison ivy. If you are sensitive to it, you can get the itchy red rash at any time of year.
To remember not to touch it, there is the saying "Hairy Rope, Don't be a dope!" Although Poison Ivy is poisonous to people, birds love to eat the white berries in fall and winter.
It is one of the first plants to change color in the fall, turning into a beautiful crimson red.