Phylloxera on rise…: Deadly insect pest poses increased risk to north coast vineyards
Open Access
- 1 March 1991
- journal article
- Published by University of California Agriculture and Natural Resources (UC ANR) in California Agriculture
- Vol. 45 (2) , 30-32
- https://doi.org/10.3733/ca.v045n02p30
Abstract
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.Keywords
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