Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:13:46.1492226Z
   4
Lettuce Cercospora leaf spot (210)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. Tropics and sub-tropics. On lettuce, and relatives in daisy family, including weeds. Occasionally, an important disease.
  • Spots circular to oval, brown, with whitish centres, up to 1 cm. Later, merge. On older leaves first.
  • Wet weather disease; spores spread in wind and rain.
  • Cultural control: in nurseries – keep free of weeds and avoid overcrowding; in field – space plants to allow air movement; drip irrigation; weed; 2-3-year crop rotation; avoid overlapping crops; collect and burn trash after harvest.
  • Chemical control: likely that cultural practices sufficient; if fungicide needed, use mancozeb.

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