Diagnosing ring spot in cereals

A foliar fungal disease of cereals that can occur throughout the Western Australia wheatbelt but is unlikely to affect grain yield.

 

Leaves have small brown spots 1-4 mm with dark brown rims and pale brown centres.
Spiky fungal structures from previously infected grass seed

What to look for

    Plant

  • Leaves have small brown spots 1-4 millimetres (mm) with dark brown rims and pale brown centres.
  • Look at soil surface near affected plant for spiky fungal structures sticking up about 3-4 mm. These are produced from previously infected grass seeds.

What else could it be

Condition Similarities Differences
Diagnosing yellow spot of wheat Small leaf leasions at early infection Yellow spot has a yellow rim
Diagnosing septoria nodorum of wheat Small leaf leasions Septoria nodorum blotch has a yellow / tan rim

Where did it come from?

Grass weeds
Grass weeds
Wet conditions
Wet conditions
  • The disease is most common where grass weeds have been a problem the previous year.
  • As spores are spread by raindrop splash, the disease is particularly common in wet areas.

Management strategies

Grass weed control
Grass weed control
  • Fungicide treatment is rarely required.
  • Reduce grass weeds, particularly brome and barley grass.
  • Avoid successive cereal crops.

Where to go for expert help

DDLS Seed Testing and Certification
+61 (0)8 9368 3721
+61 (0)8 9956 8504
Page last updated: Friday, 17 April 2015 - 2:20pm