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Am. J. Enol. Vitic. 49:1:17-22 (1998)
Copyright © 1998 by the American Society for Enology and Viticulture.
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Evaluating Resistance to Grape Phylloxera in Vitis Species with an in vitro Dual Culture Assay

Wladyslawa Grzegorczyk 1 and M. Andrew Walker 1

1 Department of Viticulture and Enology, University of California, Davis, CA 95616-8749.

malwaker{at}ucdavis.edu

Forty-one accessions of 12 Vitis L. and Muscadinia Small species were evaluated for resistance to grape phylloxera (Daktulosphaira vitifoliae Fitch) using an in vitro dual culture system. The performance of the species tested in this study was consistent with previously published studies with whole plants and helps confirm the utility of in vitro dual culture for the study of grape/phylloxera interactions. This in vitro system provides rapid results (8 wk) and the ability to observe the phylloxera/grape interaction without interference from other factors. This system also provides an evaluation that overemphasizes susceptibility, thus providing more confidence in the resistance responses of a given species or accession. Among the unusual responses were the susceptibility of V. riparia Michx. DVIT 1411; susceptibility within V. berlandieri Planch.; relatively wide ranging responses in V. rupestris Scheele; and the lack of feeding on the roots of V. californica Benth., in contrast to the severe foliar feeding damage that occurred on this species. Vitis californica #11 and V. girdiana Munson DVIT 1379 were unusual because phylloxera on them had the shortest generation times. Such accessions might be used to examine how grape hosts influence phylloxera behavior. Very strong resistance was found within V. aestivalis Michx. DVIT 7109 and 7110; V. berlandieri c9031; V. cinerea Engelm; V. riparia (excluding DVIT 1411); V. rupestris DVIT 1418 and 1419; and M. rotundifolia Small. These species and accessions seem to possess enough resistance to enable their use in breeding with minimal concern about phylloxera susceptibility.

Key words: phylloxera resistance, resistance evaluation, sterile culture, tissue culture, host/pest interactions

Submitted on July 11, 1997




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T. L. Roush, J. Granett, and M. A. Walker
Inheritance of Gall Formation Relative to Phylloxera Resistance Levels in Hybrid Grapevines
Am. J. Enol. Vitic., June 1, 2007; 58(2): 234 - 241.
[Abstract] [Full Text] [PDF]


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Copyright © 1998 by the American Society for Enology and Viticulture.