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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