Phlyctema vagabunda Causes Coin Canker of Ash (Fraxinus spp.) in North America

Plant Disease
M L Putnam, G C Adams

Abstract

During the spring of 2001, nursery-grown ash trees in Michigan and Ontario, Canada displayed coin cankers that were previously described (1). Cankered cultivars included Cimmaron®, ChampTree®, and Urbanite® (Fraxinus pennsylvanica), and Autumn Purple® (F. americana). Tissue from surface-sterilized cankers (0.06% sodium hypochlorite or 70% ethanol, 3 min) was placed onto one-half strength potato dextrose agar amended with 200 ppm of streptomycin sulfate (½ SPDA). Plates were incubated at 20 and 4°C in the dark. Phlyctema vagabunda (anamorph of Neofabraea alba (E.J. Guthrie) Verkley, (1999)) was isolated on the 4°C plates from most tissue pieces from all cultivars. P. vagabunda causes stem cankers of apple (Malus spp.) (1) but its pathogenicity to ash has never been demonstrated (2). Inoculations with P. vagabunda were made to green and white ash to fulfill Koch's postulates. Apple trees were also inoculated with the ash isolate. In Corvallis, OR, 2-year-old, bare-root ash trees and 15 1-year-old apple seedlings were inoculated in January, 2003. In Michigan, 10 trees each of cvs. Cimmaron® and Autumn Purple® were inoculated in December, 2002. The trees were inoculated with a wound-freezing method (3). Wounded sites received a 5-m...Continue Reading

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