Grape phylloxera (Daktulosphaira viiifoliae Fitch) obtained from Rutherford, Calif., appeared to overcome the resistance of the hybrid grape rootstock, Ganzin 1, in the field. These insects were reared in the laboratory and compared with phylloxera from another Napa Valley location in an excised root life-table experiment. The Rutherford phylloxera (type B) developed and laid eggs quicker and had a greater fecundity than the Napa phylloxera (type A), as indicated by life-history parameters of generation time, gross and net reproductive rates, and doubling time. On the highly resistant rootstock, St. George, a pure Vitis rupestris (Scheele) selection, the type-B phylloxera were also able to establish and reproduce better than type-A phylloxera. On the susceptible V. vinifera L. variety, Cabernet Sauvignon, both phylloxera types did equally well. These data indicate a potentially serious problem for California vineyards in coastal valleys where phylloxera are established.
Document Type: Research Article
Publication date: December 1, 1985
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.