Rice BlastIdentification & Treatment Guide 2026
Magnaporthe oryzae · Family: Magnaporthaceae
Rice blast is caused by Magnaporthe oryzae, the most destructive rice disease globally. It produces diamond-shaped gray lesions on leaves and can rot the panicle neck, causing total grain loss. Manage with resistant varieties, balanced nitrogen fertilization, silicon amendments, and fungicide applications of tricyclazole or azoxystrobin at panicle initiation.
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criticalRice Blast
- Affects
- leavesstemspanicle necknodes
- Peak Season
- Throughout rice growing season; worst during humid weather with cool nights (17-28°C)
- Spread Risk
- Fast
- Spread By
- Airborne conidia carried by wind, rain splash, infected seed, crop debris
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Symptoms: What does Rice Blast look like?
Visual identification guide — tap each stage for details
Small brown specks on leaves
Tiny brown or dark green spots (1-3 mm) appear on leaf blades, often with a water-soaked appearance initially.
Diamond-shaped gray lesions
Spots enlarge into characteristic diamond or spindle-shaped lesions (1-2 cm long) with gray centers, brown borders, and yellow halos. Lesions may coalesce.
Neck rot and panicle death
Infection at the panicle neck node causes neck blast — the neck turns brown-black and breaks. Entire panicle turns white (whiteheads) with empty grains. Can cause 50-100% yield loss.
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