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CropMonitor > Winter Wheat > Encyclopaedia > Fusarium Head Blight > Symptoms  


Symptom expression
 
The first signs of infection generally appear 5 - 7 days after infection. Initially symptoms are the same for all the species causing FHB in the UK.
  • Small, water-soaked brownish spots at the base/middle of the glume or on the rachis
 
Depending on the species, initial symptoms develop to form:
  • Discrete lesions with bleached centres and dark brown margins (F. poae and F. langsethiae)

  • Bleaching of one or more spikelets (M. nivale and F. avenaceum)

  • Bleaching of the entire head (F. culmorum and F. graminearum). Development of blue/black perithecia giving a 'scabbed' appearance can be associated with infections by Gibberella zeae (F. graminearum).

 
F. poae and F. langsethiae  M. nivale
 
 
F. culmorum and F. graminearum F. avenaceum
 
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