Issue link: http://read.dmtmag.com/i/155925
SOIL REMI COHEN & CELLAR of GRBaV, many nurseries inspected only material based on symptoms, allowing the CDFA certified block inspection program to take care of the majority of testing. That has changed in recent years, with the discovery of the transmissibility of certain strains of leafroll by mealybugs, and the recent discovery of GRBaV. Novavine, for example, tests its material every three years, the larger Sunridge every five. Dan Martinez of Martinez Orchards in Winters, who has been involved with the NCPN, reminded seminar attendees that it is not only important how frequently the blocks are tested, but also what percent of material within a block should be tested. He also brought up concerns about inconsistency in lab results, which can include false negatives and positives, in addition to the fact that it is unfeasible to test every vine. In addition to planting Protocol 2010 material, locating and elimi- Dan Martinez of Martinez Orchards raised concerns about inconsistent lab results when testing plant material. nating vines with leafroll, red blotch and or other viruses in existing blocks is a difficult and expensive step for nurseries. Fortunately, very few vines have tested positive for red blotch in the increase blocks of "We have a complete Crush Pad Package from Carlsen & Associates. We find it effective, efficient and safe. Our best experience with Service is hands down, Carlsen & Associates. Their team is very effective and knows the equipment inside and out. They should, they built it." Erik Miller - Owner / Winemaker Kokomo Wines Healdsburg, CA Carlsen & Associates 707-431-2000 34 V I N E YARD & WINERY MANAGEMENT | Sept - Oct 2013 these nurseries, although there have been studies that show that recently released material from production nurseries has been contaminated. Even if red blotch, leafroll and other infected vines are removed, there still remains the challenge of keeping the remaining material clean, especially as the industry continues to discover the impact of vectors on the spread of virus. This challenge is shared by growers who have planted clean material that might get infected by vectors. We know that certain strains of leafroll, including GLRaV-3, are spread by mealybugs, that grapevine fanleaf virus (GFLV) is spread by the dagger nematode, and that red blotch is a genetic relative to other viruses spread by leafhoppers and aphids. This presents a tremendous challenge to the industry at large, and Martinez poignantly stressed the need for continued research and financial support for research efforts. Dr. Andy Walker IPM for Grapes: Your Pest Management Solution Davis Instruments' Integrated Pest Management software modules link your weather data to actual pest risk, helping you prevent crop damage before it starts. Used together with our Vantage Pro2™ Weather Station, a Wireless Leaf & Soil Moisture/Temperature Station and Weatherlink® software, Davis offers you a complete solution for crop management. Visit www.davisnet.com/weather/IPM and click on the Integrated Pest Management link to download our FREE demo software today. VWM1309 800-678-3669 www.davisnet.com w w w. v w m m e d i a . c o m