Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:13:48.2018061Z
   3
Lettuce Septoria leaf spot & blight (150)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • 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.

No responses yet...