Pierce’s disease has been the limiting factor in bunch grape production in Florida. Symptoms include a general loss in plant strength, followed by death of the vine. Different species of grapes have a range of tolerance to Pierce’s disease. High vulnerability of premium wine grapes has practically eliminated the possibility of a wine industry in Florida.

DISEASE SYMPTOMS

  • Delayed leafing in the spring
  • Shoot dwarfing
  • Marginal scalding of leaves
  • Leaf mottling and interveinal chlorosis and necrosis
  • Wilting and premature coloring of fruit
  • Uneven maturity of canes
  • Eventual death of the root system
  • From IFAS Database (EDIS)

CAUSAL AGENT

  • A fastidious bacterium, Xyllella fastidiosa

HOST RANGE

  • Grape

GEOGRAPHIC DISTRIBUTION

  • Southeastern United States
  • California
  • Southern Ontario

SPREAD OF THE PATHOGEN and CONTROL OPTIONS

  • Spread by leafhoppers known as sharpshooters
  • Control options: none

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