Initially appears as water soaked areas on the leaf, sheath or stem that turns grey green then develops bleached centres with a dark brown rim and often with a yellow halo. The upper stem rarely has lesions. Heads and grain can be affected when rain falls after heading.
Barley, Barley Grass.
More common in wet conditions with early sown crops.
Survives on residues of Barley and Barley Grass.
Spores are spread by raindrop splash from the residues to the plant and then from plant to plant.
Can be seed borne.
Varieties differ widely in their tolerance and the tolerance appears to differ between seasons and regions.
Origin and History:
Most common in South Australia.
Foliar fungicides are usually only economical on crops with a yield potential of more than 3 t/ha.
It causes most damage in seasons with frequent rain on early sown crops in paddocks with infected Barley or Barley Grass residues in the medium to high rainfall areas.