Halo Blight of Oats
Pseudomonas syringae pv. coronafaciens
Light green, water soaked spots, up to 1 cm diameter, appear initially and enlarge to oval spots with a yellow centre and a yellow green halo. As the disease progresses, the spots merge into brown irregularly shaped blotches. The leaves may wither and die, starting from the tip.
Biology:Survives on crop residues and seed.
Spread by raindrop splash, direct contact and aphids or other insects.
Moist weather favours disease spread and warm dry weather stops spread.
Life Cycle:Origin and History:
Management and Control:
Plant resistant varieties. See Disease Susceptibility of Oat Varieties.
Plant clean seed.
Avoid planting into Oat stubble.
Burn, bury or graze Oat stubbles.
Related and Similar Species:References:
Collated by HerbiGuide. Phone 08 98444064 or www.HerbiGuide.com.au for more information.