Fusarium Ear Blight - Causal Organism

Causal Organism

The Fusarium ear blight is due to a Fusarium fungus. There are five major species of Fusarium:

  • Fusarium avenaceum (Gibberella avenacea)
  • Fusarium culmorum
  • Fusarium graminearum (Gibberella zeae)
  • Fusarium poae
  • Microdochium nivale (Monographella nivalis, formerly Fusarium nivale)

The aggressive form of headblight is caused by Fusarium graminearum. Fusarium graminearum is an ascomycete, producing sexual spores in a sac known as an ascus (plural asci). The asexual stage of the fungus produces spores called macroconidia, and the sexual stage produces spores called ascospores.

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