Pierce's disease of grapevine
General Xylella fastidiosa is a gram-negative bacterium which is limited to xylem tissue. It has many hosts, many of which show minor or no symptoms. More [...] from early to midsummer. The necrotic area spreads over the leaf from the margin and is marked by a chlorotic band. In the beginning, only a few leaves [...] and tylose, a glue-like substance, in the vessels. The bacteria, gum and tyloses block the vessels, causing the plants to wilt. Transport to different plant