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Agri-Analysis Proprietary Leafroll 3 Virus Test Continues to Lead Industry Standard

Posted on March 05, 2019

 Grapevine leafroll associated virus type (GLRaV-3) is a highly divergent virus and there are currently ten genetic variants known, many are still unknown. Commercial labs generally use published methods for LR3 testing. However, these methods fail to detect all variants in growers samples. When these methods are used in certification programs, they may let LR3 escape detection, resulting in LR3 infected vines in certified materials. In 2013, we realized this was a big problem and developed our own proprietary method for LR3. In developing and testing the new method we included strains that were not even known at the time. The detail of this work was described in Wine Business Monthly in 2014:

Our method continues to be the leading industry method for LR3 simply because it captures more variants than any other method. This method has been widely evaluated in CA, Washington, Oregon, Idaho, New York, Australia, Israel, South Africa, Spain, New Zealand, etc. All collaborators report 100% detection of all LR3 variants in their possession. We hope this method will be adopted as the industry standard if and when such a standard is established by federal and state agencies, and/or by the industry. For more information please contact Dr. Allan Wei, Agri-Analysis LLC, 950 West Chiles Road, Davis, CA 95618, 800.506.9852. Agri-Analysis LLC, loated in Davis, CA, is a commercial testing laboratory that provides the most rapid and reliable tests for grapevine leafroll 3 virus (GLRaV-3) and grapevine red blotch virus (GRBaV). Sample request form can be downloaded on its web site

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