Bondi Junction NSW, Australia
Fact Sheets
Rice blast (252)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide distribution. On rice and wild grasses. An important disease.
  • Spots oval or diamond-shaped, 5-15 mm, with whitish-grey centres and dark brown borders, merging, killing the leaves. Rots of leaf sheath, stem and panicles. Plants killed until tillering stage.
  • Spread of spores in irrigation water and by wind.
  • Cultural control: sow to avoid flowering at wettest times; avoid overlapping crops; split N applications; space plants to maximise air flow; collect and burn trash after harvest. Use chemicals at heading stage.
  • Chemical control: Seed/field treatment: mancozeb, captan (protectants); azoles, strobilurins (eradicants).

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