grape leafroll disease perrin collins university of georgia
Post on 17-Dec-2015
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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
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