Leafroll disease is spreading rapidly in a Napa Valley vineyard
AuthorsDeborah A. Golino
Authors AffiliationsD. Golino is Cooperative Extension Plant Pathology Specialist, Department of Plant Pathology, UC Davis; E. Weber was County Director and Farm Advisor, UC Cooperative Extension Napa County (deceased; see box); S. Sim is Staff Research Associate, Department of Plant Pathology, UC Davis; A. Rowhani is Plant Pathology, Specialist, Department of Plant Pathology, UC Davis.
Hilgardia 62(4):156-160. DOI:10.3733/ca.v062n04p156. October 2008.
In the 1930s and 1940s, little was known about viruses, and information 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 leafroll 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. Leafroll 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 leafroll disease.
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Also in this issue:Tip Length Models for Major Commercial California Conifers
Wine grapes go green: The Sustainable Viticulture Story
Research fuels sustainable viticulture revolution
Nest boxes can attract wildlife to vineyards
Agro-environmental partnerships facilitate sustainable wine-grape production and assessment
Sidebar: Interest in organic winegrowing is increasing
Innovative outreach increases adoption of sustainable winegrowing practices in Lodi region
Decision support tool seeks to aid stream-flow recovery and enhance water security
Sidebar: Collaborative conservation helps achieve regional water-quantity goals
Botryosphaeria-related dieback and control investigated in noncoastal California grapevines
Sidebar: Vine surgery tested as management strategy for
Vineyard managers and researchers seek sustainable solutions for mealybugs, a changing pest complex
Sidebar: Pomace management reduces spread of vine mealybugs
Sidebar: Studies needed of vectors spreading leafroll disease in California vineyards
Liquid baits control Argentine ants sustainably in coastal vineyards
Vineyard floor management affects soil, plant nutrition, and grape yield and quality
Self-reseeding annual legumes evaluated as cover crops for untilled vineyards
Soil-landscape model helps predict potassium supply in vineyards
Vineyard nutrient needs vary with rootstocks and soils