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We thank the Napa Valley Grape Growers Research Committee for financial support. We also thank Edward Weber and Bruce Holst, for excellent technical assistance, and June McCaskill for the identification of plant species and Alexander H. Purcell for providing healthy leafhoppers. All reprint requests should be addressed to the second author. Mention of a trademark or proprietary product does not guarantee a warranty of the product by the U.S. Department of Agriculture and does not imply approval of it to the exclusion of other products that also may be suitable.

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Cited" for citations referred to in the text by author and date. [ 455 ] 456 JEilgardia [Yol. 27, No. 17 * Symptoms induced in Alpine indicator plants except for the leaf-curl virus and the chronic symptoms of the lesion-A and lesion-B viruses which are in the UC-1 clone.