1. Grape Leafroll Disease Perrin Collins University of Georgia

2. Grape Leafroll Virus

3. 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

4. PCR Results Virus Samples Testing Positive / Total Samples GLRaV10/10 GLRaV20/10 GLRaV38/10 GLRaV40/10

5. Georgia Grape Quality Tests Average Cluster WeightBrixpH Infected Vines0.57314.8752.9459 Healthy vines0.6816.58753.0332