As I have reported over the last 2-3 years, we are observing warming winter temperatures, and as a result, we are also observing increasing levels of Pierce’s disease (PD). With colder winter temperatures, the bacteria that causes PD, Xylella fastidiosa, can actually be “cured” from the vine. With warmer temperatures, the bacteria survives and kills … Continue reading Pierce’s Disease now Expanding to Higher Elevations