Grape Leafroll Disease Perrin Collins University of Georgia.
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Grape Leafroll Disease Perrin Collins University of Georgia
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Transcript of Grape Leafroll Disease Perrin Collins University of Georgia.
Grape Leafroll Disease
Perrin CollinsUniversity of Georgia
Grape Leafroll Virus
Why is GLD important?
Effects of GLD
Detrimental to grape quality:-pH, sugars, berry weight
Berry Maturity
Reduced vine vigor and fruiting
“Yield reductions directly attributable to GLD vary, but reductions in the neighborhood of 50% (or more if the disease is severe) are commonly reported on a worldwide basis.” –Dr. Naidu Rayapati
PCR Results
VirusSamples Testing Positive /
Total Samples
GLRaV1 0/10
GLRaV2 0/10
GLRaV3 8/10
GLRaV4 0/10
Georgia Grape Quality Tests
Average Cluster Weight Brix pH
Infected Vines 0.573 14.875 2.9459
Healthy vines 0.68 16.5875 3.0332