Wood on a new grape cane that has matured irregularly, resulting in patches of green, surrounded by mature brown bark, a symptom called "green islands." Grapes that have dried (raisened) up before harvest time and leaves that have dropped prematurely but left behind their petioles that are dying back from the tip (matchsticking). These symptoms are due to Pierce's disease, Xylella fastidiosa.
Photo by Jack Kelly Clark.