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