Comparative Spore Morphology and Pathogenicity of Four Florida Isolates of Nectria galligena. E. L. Barnard, Forest Pathologist, Divisions of Forestry and Plant Industry, Florida Department of Agriculture and Consumer Services, P.O. Box 1269, Gainesville 32602. N. E. El-Gholl, and S. P. Gilly. Plant Pathologist, Division of Plant Industry, Florida Department of Agriculture and Consumer Services, P.O. Box 1269, Gainesville 32602, and Biologist, Divisions of Forestry and Plant Industry, Florida Department of Agriculture and Consumer Services, P.O. Box 1269, Gainesville 32602. Plant Dis. 72:973-976. Accepted for publication 25 June 1988. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1988. DOI: 10.1094/PD-72-0973.

Perithecia of Nectria galligena were observed in the field in association with 1) stem galls on Cercis canadensis, 2) hypertrophied, roughened, and fissured bark in branch axils of Swietenia mahagoni, and 3) stem cankers on Quercus laurifolia and Acer rubrum. In the greenhouse, canker symptoms developed on seedlings of all four hosts in response to artificial wound inoculations with mass isolates from each host. Symptoms produced on S. mahagoni by the S. mahagoni isolate, however, were notably restricted in comparison with those produced on the other three hosts. Observations and measurements performed on ascospores, as well as on conidia of the Cylindrocarpon heteronema anamorph, revealed no distinct differences in spore sizes or septation patterns among isolates. C. canadensis, S. mahagoni, and, possibly, Q. laurifolia represent new host and suscept records for N. galligena.