/ wine quality Content for ºÙºÙÊÓƵ en /news/grapevine-red-blotch-disease-threatens-us-grape-industry <p>University of California, Davis, scientists will lead a collaborative effort to study grapevine red blotch disease, which threatens the $162 billion U.S. grape industry. The virus causes red veins and blotches on grape leaves. The fruit on diseased plants is smaller, ripens more slowly, and its sugars and colors are muted.</p> December 10, 2019 - 11:00am Amy M Quinton /news/grapevine-red-blotch-disease-threatens-us-grape-industry