Vineyard & Winery Management

May/June 2013

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Although originally found associated with red blotch disease, GRBaV has also been detected in white grape varieties such as chardonnay. Know Your Viruses The most important virus is the one in your vineyard BY JUDIT hroughout my career I have been asked many times: Which is the most important virus affecting the vineyard? The answer is easy: the one in your vineyard (or neighbor's vineyard). But seriously, many factors must be taken into consideration to answer this question. This article describes known 70 V I N E YARD & WINERY MANAGEMENT | MONIS, PH.D. viruses that affect grapevines and their effect in the vineyard, as well as new viruses to watch out for. GRAPEVINE ASSOCIATED VIRUS More than 60 viruses have been described to infect grapevines. Some have serious effects on vine health and subsequent wine quality May - June 2013 to warrant vigilant field testing and pre-planting screening. When a virus is discovered, it is important to follow certain steps known as "Koch's postulates" to determine if it causes disease. The steps involve the isolation of the virus from grapevines and reproducing specific disease symptoms in a healthy vine. There are a few w w w. v w m m e d i a . c o m

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