Abstract
Abelia (A. grandiflora (Andre) Rehd.) is widely grown as an ornamental shrub in the South. In midsummer, beginning about the middle of June, the leaves become spotted with irregular, diffuse, purple to brown spots. These commonly abscise and fall. New foliage forms on the denuded shoots, and this in turn becomes spotted and abscises, so that, by the end of September, the shrubs are almost completely defoliated. Then, with the advent of cool weather in late fall, new leaves develop, and these remain healthy green until the following summer. This defoliation has been accepted by nurserymen and gardeners as natural. This paper presents evidence to show that this summer de? foliation is not natural (Abelia grandi flora is an evergreen plant) but the result of infection by an apparently undescribed species of Cercospora. As far as the writer has been able to determine, no Cercospora has ever been described on this host. The pathogen is therefore described as a new species.
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