Pierce's disease of grapevine
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 [...] of the canopy on a few branches and then extends to the rest. Eventually, the whole root system is killed and the trees die. Life cycle and appearance of [...] 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