Bondi Junction NSW, Australia
Fact Sheets
Watermelon fruit blotch (196)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Widespread. Not reported from Africa. On cucurbits, including wild species. An important bacterial disease. More serious on watermelon.
  • Greyish spots on seedlings; those on stem cause death. Fruit infections occur early with dark green areas near harvest, superficial at first, later cracking.
  • Spread from seed to leaves and then in wind and rain.
  • Cultural control: certified seed; 2-year crop rotation; check seedlings; disinfect nursery after outbreaks (bleach); grow new crops far from other cucurbits; remove volunteers; use drip irrigation; clean equipment used in diseased fields; tolerant varieties; collect and burn debris after harvest.
  • Chemical control: copper, if symptoms seen early.

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