Photos of rice blast disease caused by the fungus Pyricularia oryzae, including fungal signs and symptoms on the plant.
Slide 1: Ten-day old Pyricularia grisea colony on rice leaf agar showing fungal mycelium and spore formation (blue gray area).
Slide 2: Lemon-shaped Pyricularia oryzae spores produced on agar culture.
Slide 3: Typical Pyricularia oryzae spores produced on the rice plant showing conidia forming on conidiophores.
Slide 4: Pyricularia oryzae spore germination and early infection cushion formation on a rice leaf.
Slide 5: Early blast lesion formation on rice leaves.
Slide 6: A longer type blast leaf lesions.
Slide 7: Older dried rice blast leaf lesions.
Slide 8: Screening for leaf blast resistance in an upland nursery showing dead susceptible plants to undamaged resistant plant symptoms.
Slide 9: Blast leaf lesions on resistant (top leaf) and susceptible (lower leaf) varieties (note smaller and darker lesions on resistant leaves).
Slide 10: Dark shriveled rice stem nodes symptomatic of infection with the rice blast pathogen.
Slide 11: Rice nodes with blast infection symptoms.
Slide 12: Rice flag leaf collars symptomatic of infection with the rice blast pathogen.
Slide 13: Severe blast infection on rice leaf collar.
Slide 14: Rice neck blast.
Slide 15: Rice neck blast showing fungal sporulation.
Slide 16: Neck blast (right and center) versus rotten neck blast (right).
Slide 17: Close up view of neck blast showing tissue damage.
Slide 18: Left to right - very susceptible, susceptible, and moderately resistant reactions to neck blast.
Slide 19: Neck and panicle blast symptoms on rice heads.
Slide 20: Small panicle branches infected with blast.
Slide 21: Rice heads showing symptoms of rotten neck, neck, and collar blast infections.
Slide 22: Severe panicle blast.
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The LSU AgCenter and the LSU College of Agriculture