Vaccinium Clones Resistant to Phytophthora cinnamomi1

in HortScience
Authors:
A. D. DraperU. S. Department of Agriculture, Beltsville, Maryland

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S. M. MircetichU. S. Department of Agriculture, Beltsville, Maryland

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D. H. ScottU. S. Department of Agriculture, Beltsville, Maryland

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Abstract

Two clones of Vaccinium showed high field-resistance to Phytophthora cinnamomi and remained unaffected during 3 years of observation in naturally infested soil: Me-US 32, a productive, cultivated highbush selection (V. australe), and a selection from the wild of the diploid species (V. atrococcum). However, the clone, E-22 selection of V. australe, growing in adjacent row to the resistant clones was severely damaged by the pathogen. Phytophthora cinnamomi was readily isolated from soil surrounding both resistant and susceptible clones.

Contributor Notes

Received for publication December 3, 1970.

Research Geneticist, Plant Pathologist and Horticulturist, respectively, Plant Science Research Division, Agricultural Research Service.

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