Anthracnose Caused by Discula fraxinea on the New Host Chinese Fringetree and White Ash in Delaware

Plant Disease
N Fisher GregoryL A Castlebury

Abstract

Leaf blight or anthracnose symptoms have been noted on the current year's growth of Chinese fringetree (Chionanthus retusis L.) since the early 1990s in Newark, DE. Symptoms begin as dark, greenish brown, water-soaked lesions on the edges of young leaves. With time, lesions enlarge, turn darker brown, and coalesce with necrotic areas turning dry and light brown. Isolations from infected leaves consistently yielded a golden brown fungal culture on acidified potato dextrose agar. Similar symptoms were observed on white ash (Fraxinus americana L.), from which a similar fungus was isolated. C. retusis and F. americana belong to the Oleaceae, the olive family. Acervuli were inconspicuous on leaves, but conidia were easily observed. Conidia were small, non-septate, ellipsoidal, hyaline, and averaged 5.5 × 3.5 μm. In culture, the fungus formed conspicuous, concentric zones of flocculent mycelium and spherical conidiomata when exposed to diurnal light. Isolates from C. retusis and ash were identified as Discula fraxinea (Peck) Redlin & Stack, the anamorph of Gnomoniella fraxini Redlin & Stack (Gnomoniaceae, Diaporthales) (3). Sequences of the internal transcribed spacer region (ITS) of rDNA indicated that the isolates from C. retusis a...Continue Reading

Citations

Jan 1, 2008·Studies in Mycology·M V SogonovJ F White

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