Impairment of Grapevine Xylem Function by Phaeomoniella chlamydospora Infection Is Due to More than Physical Blockage of Vessels with 'Goo'
It is associated with the grapevine trunk diseases, esca and Petri disease. Infection is usually accompanied by
a dark tarry substance, commonly refered to as ‘black goo’, in some of the xylem vessels. Examination of field grown
Verdelho demonstrated that infection reduced xylem function by 16% for each 1% increase in ‘goo’-blocked vessels,
indicating that vessel blockage is not solely responsible for loss of xylem function.
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