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Effect of Culture Age on Virulence of Artificial Cytospora Infections in Prunus domestica. A. W. Helton, Plant Pathologist, Department of Plant Sciences, University of Idaho, Moscow 83843. Phytopathology 60:1694-1695. DOI: 10.1094/Phyto-60-1694.

Four-year-old President plum (Prunus domestica) trees were inoculated on the same day with cultures of Cytospora cincta that were 2, 3, 4, 5, 6, 8, 12, 16, and 21 days old. Virulence decreased with culture age, and cultures aged in sealed plastic containers appeared to retain given levels of virulence longer than those not stored in plastic.

Additional keywords: virulence, culture age.