Now that there are no leaves on the trees, it is a good time to look for Oriental Bittersweet (Celastrus orbiculatus). This invasive species is on the ERADICATE list. It is a vine that girdles and smothers trees and shrubs. Look for the bright red fruit with yellow capsules.
Be sure to check your ID with the native American bittersweet, which has orange fruit capsules instead of yellow. American bittersweet fruits are found only at the end of the vine while Oriental bittersweet has fruit at the leaf axils.