Notes on Blueberry Diseases
Blueberry scorch
Identification
Blueberry scorch is a complex of virus diseases, which include Sheep
Pen Hill disease in New Jersey and blueberry scorch on the west coast.
Blueberry scorch has not been found in Ontario but it is a very serious
problem where it occurs. Growers must be aware of the potential for this
disease and quick to respond if it develops. Symptoms include leaf and
flower blight, advanced necrosis and eventual death of diseased plants.
Some varieties show no symptoms while others show severe symptoms. A characteristic
symptom on some cultivars is the sudden blighting of blossoms, which then
hang on the bushes all -season.
Period of activity
The disease is probably transmitted by aphids and spreads quickly in
a circular pattern from the infected plant. Aphids can be present any
time in the growing season. There can be a long latent period, up to two
years, from the time plants are infected until symptoms appear.
Management notes
Purchase virus-tested planting stock from an accredited nursery. Test
bushes that show symptoms of the disease, by sending samples of young
leaves and blossoms to the Pest Diagnostic Clinic in Guelph. Remove and
destroy infected bushes.
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