University of California

Phylloxera on rise…: Deadly insect pest poses increased risk to north coast vineyards


Jeffrey Granett
John A. De Benedictis
James A. Wolpert
Edward Weber
Austin C. Goheen

Authors Affiliations

Jeffrey Granett is Professor and Chair, Department of Entomology, UC Davis; John A. DeBenedictis is Staff Research Associate, Departrnent of Entomology, UC Davis; James A. Wolpert is Extension Viticulturalist, Department of Viticulture and Enology, UC Davis; Edward Weber is Viticulture Farm Advisor, NapaCounty; Austin C. Goheen is Plant Pathologist, emeritis, UC Davis and USDA-ARS.

Publication Information

Hilgardia 45(2):30-32. DOI:10.3733/ca.v045n02p30. March 1991.

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Resistant rootstocks protect grape vines from phylloxera; however, a new form of this insect, Biotype B, threatens the survival of 70% of Napa and Sonoma County vineyards, those which are planted on the rootstock AxR#1. Research demonstrates that different accessions of AxR#l are equally susceptible to damage by this insect, a form of plant lice. The insect has spread from two sites in 1983 to more than 70 sites in those two counties; spread to other grapegrowing counties is likely.

Granett J, De Benedictis J, Wolpert J, Weber E, Goheen A. 1991. Phylloxera on rise…: Deadly insect pest poses increased risk to north coast vineyards. Hilgardia 45(2):30-32. DOI:10.3733/ca.v045n02p30
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