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- Title
Leafroll disease is spreading rapidly in a Napa Valley vineyard.
- Authors
Golino, Deborah A.; Weber, Ed; Sim, Susan; Rowhani, Adib
- Abstract
In the 1930s and 1940s, little was known about viruses, and in formation on plant diseases caused by viruses was just beginning to appear in the scientific literature. Problems with grapevines in California, first referred to as "red leaf," were initially attributed to inexperience in viticultural techniques and poor growing conditions. However, the problem was later identified as lea froll disease, which causes red leaves, and poor yields and fruit quality. We evaluated its rate of spread for 5 years in a Napa Valley vineyard, and found an average rate of more than 10% per year. Lea froll disease can be vectored by low-level populations of grape mealybugs, and is now spreading rapidly in at least one Napa Valley vineyard for unknown reasons. Using stock for planting vines that is certified as virus-free is a key strategy in preventing the spread of grapevine lea froll disease.
- Subjects
NAPA Valley (Calif.); CALIFORNIA; GRAPEVINE leafroll virus; EPIDEMICS; GRAPE diseases &; pests; MEALYBUGS; PLANT viruses; VINEYARDS
- Publication
California Agriculture, 2008, Vol 62, Issue 4, p156
- ISSN
0008-0845
- Publication type
Article
- DOI
10.3733/ca.v062n04p156