Bondi Junction NSW, Australia
Fact Sheets
Potato late blight (265)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide distribution. On potato, tomato and relatives, and weeds. An important disease.
  • Irregular patches of rot on leaves; white cottony growth with spores on undersides. Leaves yellow, shrivel and fall. Tubers rot. Spread in wind and rain and in “seed”.
  • Cultural control: certified seed; remove volunteers; drainage; 2-3-year crop rotation; spacing to aid air movement; drip irrigation; limit amount of N; early tolerant varieties, avoid cull piles; collect and burn trash after harvest.
  • Chemical control: chlorothalonil, mancozeb, or copper; alternate with, e.g., dimethomorth, metalaxyl, cymoxanil, or strobilurins. Phosphorus acid either alone or with chlorothalonil.

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