First Report of Colletotrichum destructivum on Curly Dock

Plant Disease
Hyang Burm Lee, C-J Kim

Abstract

Curly dock (Rumex crispus L.) is a perennial deciduous plant in the family Polygonaceae. It is widely distributed in grasslands and orchards and is an important weed that is traditionally used as a medicinal herb. During the summers of 2000 and 2001, a severe anthracnose disease was observed on leaves of mature curly dock in the foothills near the western coastal area of Muchangpo, Ungchon, the district of Chungnam in Korea. Initial symptoms usually appeared in June as a small number of slightly soaked spots on leaves. Typical symptoms, generally observed in late July and August following a long, rainy, hot period, consisted of a number of brown leaf spots that expanded and often twisted, resulting in discoloration of whole parts to blackish brown or slightly reddish brown and defoliation. A fungus, which was isolated from the leaf lesion, was identified as Colletotrichum destructivum O'Gara based on previous descriptions (1,3). The fungus was characterized by conidia, which were long, relatively narrow, and straight to slightly curved with abruptly tapered and obtuse ends, complex appressoria, and cultures with apricotto salmon-colored sectors that lacked sclerotia. Conidial size ranged from 4.0 to 6.4 μm (average 4.8) × 10 to...Continue Reading

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