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Susceptibility of Apricot Tree Pruning Wounds to Infection by Eutypa armeniacae. D. E. Ramos, Department of Plant Pathology, University of California, Davis, CA 95616; W. J. Moller(2), and Harley English(3). (2)(3)Department of Plant Pathology, University of California, Davis, CA 95616. Phytopathology 65:1359-1364. Accepted for publication 24 June 1975. DOI: 10.1094/Phyto-65-1359.

The susceptibility of apricot tree pruning wounds to Eutypa armeniacae was evaluated under field and controlled conditions. Pruning wounds made in the fall remained susceptible for at least 42 days, whereas wounds made in the spring became resistant to invasion by the pathogen within 14 days. Wounds made in midwinter were intermediate between those made in the fall and spring. Pruning wounds on young trees held at 20 C became resistant to infection much faster than those maintained in a dormant condition at 3 C. High humidity hastened the development of resistance. Heartwood of large pruning wounds was resistant. A California isolate was more virulent than an Australia isolate of E. armeniacae.

Additional keywords: epidemiology, Cytosporina dieback.