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Fusarium head blight (scab). Pink mold, whiteheads, tombstone scab Same Fusarium that causes crown rot DON limit 1 ppm. Symptoms. Tan to brown discoloration at the base of the head Diseased spikelets (partial bleaching of the head) or entire head turns white

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fusarium head blight scab
Fusarium head blight (scab)
  • Pink mold, whiteheads, tombstone scab
  • Same Fusarium that causes crown rot
  • DON limit 1 ppm
symptoms
Symptoms
  • Tan to brown discoloration at the base of the head
  • Diseased spikelets (partial bleaching of the head) or entire head turns white
  • Under moist conditions, pink/orange color is seen (produced by fungal spores and hyphae) on the surface of the glumes
  • Infected kernels are shriveled, white, and chalky in appearance (‘tombstones’)
scab in barley vs scab in wheat
Scab in barley vs. scab in wheat
  • Barley flowers before head emergence; spray earlier
  • 2-row barley less suceptible than 6-row barley (head architecture)
fusarium head blight history

Occurrence of Fusarium

head blight in the USA 1991-1996

Fusarium head blight history
  • Fusarium graminearum ‘of the grasses’
  • First described in early 1900s
future fusarium head blight control
Future: Fusarium head blight control

X

  • Rotation
  • Fungicide application at flowering
    • Folicure, what others? Quilt?
    • May not be economical
  • Use a ‘more resistant’ variety
    • Many resistant varieties from other regions of the country are not adapted to MT conditions
fusarium head blight pathogen
Fusarium head blight pathogen
  • Residue-borne
    • Corn & wheat residue ‘massively colonized’
    • Scabby seed blown out of the combine in the previous year
  • Conidiospores (asexual) splash dispersed, Ascospores (sexual) forcibly ejected from asci
  • Infection occurs when spores land on susceptible heads
  • Most susceptible at flowering
  • Limited by moisture
scab in barley vs scab in wheat7
Scab in barley vs. scab in wheat
  • Barley flowers before head emergence; spray earlier
  • 2-row barley less suceptible than 6-row barley (head architecture)
future fusarium head blight control8
Future: Fusarium head blight control

X

  • Rotation
  • Stop irrigation before first flowering: 10-14 days
  • Fungicide application at flowering
    • Folicur (Sec. 18 next year?, Proline or Prosaro label 2008?)
    • May not be economical
      • Folicur $6/A; Proline $17.50/A
    • Need to combine tolerant varieties with fungicide application
    • Orient nozzles towards heads, not downwards (forward/backward, not just forward)
  • Use a ‘more tolerant’ variety
    • Many varieties from other regions of the country are not adapted to MT conditions
    • No/poor resistance currently available in malt barley
slide11

<2004

YR2007

YR 2005, 2006

Dyer, 2008

Fusarium head scab in Montana

Map http://www.peninsulaflyfishers.org/Fishing_Tales/montanaSpring02/montana_map.gif