Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:10:27.0324446Z
   1
Beetroot (silver beet) leaf spot (320)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. Damage mostly on older leaves, especially severe on sugar beet, but also on beetroot, silver beet, Amaranthus, spinach, lettuce, weeds. Potential to damage baby-leaf crops.
  • Leaf spots, round to irregular, 2-5 mm wide, ash-grey to pale brown, usually with brown or reddish-purple borders. Spores develop on the spots; sometimes centres fall out. Spots join together, leaves dry, later collapse, although remain attached to the plant.
  • Spread by rain-splash and wind. Survival on crop debris in soil, seed, weeds.
  • Cultural control: certified seed; weed (especially, Chenopodium); collect debris and destroy after harvest; crop rotation.
  • Chemical control: use mancozeb. Apply when symptoms first appear, repeating at 7-10 intervals.

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