Leafroll disease is spreading rapidly in a Napa Valley vineyard

Sim, S; Golino, D; Rowhani, A; Weber, E

Leafroll disease is spreading rapidly in a Napa Valley vineyard

Authors

Susan Sim
Deborah A. Golino
Adib Rowhani
Ed Weber

Authors Affiliations

S. Sim is Staff Research Associate, Department of Plant Pathology, UC Davis; D. Golino is Cooperative Extension Plant Pathology Specialist, Department of Plant Pathology, UC Davis; A. Rowhani is 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).

Publication Information

Hilgardia 62(4):156-160. DOI:10.3733/ca.v062n04p156. October 2008.

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Abstract

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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Agro-environmental partnerships facilitate sustainable wine-grape production and assessment

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Decision support tool seeks to aid stream-flow recovery and enhance water security

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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