Bondi Junction NSW, Australia
Fact Sheets
Lettuce Septoria leaf spot & blight (150)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide distribution. On lettuce. An important disease.
  • A fungus producing large spots between the veins which dry and fall out. Fruiting bodies filled with spores occur in the spots. Spread occurs in rain-splash, wind-driven rain, and in infected seed.
  • Worse during periods of high rainfall when spots merge to destroy leaves and reduce quality.
  • Cultural control: use certified seed; check plants in the nursery for leaf spots; use drip rather than overhead irrigation; collect debris and incorporate into soil or burn; 3-year crop rotation.
  • Chemical control: use copper or mancozeb; if systemic products needed, use triazoles.

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