Dr. Naidu Rayapati says that the discovery of mixed virus infections in grape vineyards makes thorough testing more important than before. The world of grapevine viruses is complicated, Washington State University researchers are learning. Many of the samples taken from Washington vineyards not only have grapevine leafroll virus, but also other viruses, making testing more difficult and time consuming. Grapes have more documented diseases than any other single perennial crop, according to WSU grape virologist Dr. Naidu Rayapati. Nearly 60 viruses are known to affect grapes worldwide, with grapevine leafroll disease the most common, accounting for about 60 percent of […]
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