Symptoms and Signs
Scald develops on leaves as oval to irregular blotches that have
a bluish green, water-soaked appearance (Photo 19). As the tissue
dries, the lesion changes to brown, then to light tan bordered
by a brown margin. The lesions often have a zonate or "scalded"
The fungus over-winters on dead leaves and in seed. It survives
longest in residue above the soil surface. The fungus produces
abundant conidia on wet lesions during cool, damp weather after
the leaf tissue has become necrotic. Conidia, spread by wind
and splashing rain, infect young leaves of spring- planted grain.
Optimum temperatures for sporulation and infection range from
59 to 68F. Hot, dry weather stops the disease, but new infections
may occur in the fall.
Cultural. If scald is severe enough to warrant
control, rotating crops, plowing under diseased plant residue,
and destroying infected volunteer barley and grasses can help
Resistance.Some resistant barley cultivars are
available, but these may not be adapted to the Northwest. The
cultivar, 'Luther,' is quite susceptible and may suffer damage
in western Washington.
According to the PNW
Plant Disease Control Handbook, 'Gwen', 'Hundred' and 'Kold'
are resistant to some strains of the fungus. The handbook also
has fungicide recommendations.
Webster, R.K., L.F. Jackson, and C.W. Schafer. 1980. Sources
of resistance in barley to Rhynchosporium secalis. Plant
Other Interesting Barley
Alberta Agriculture, Food and Rural Development -- description
Scald," Integrated Disease management in Small Grains,
Virginia Cooperative Extension -- pictures and links to descriptions.
Diseases * Barley
Home Page * Small
Grains Home * Grow Serve
Edited and reviewed by Ed Adams, WSU Extension Plant Pathologist
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