The Sweetpotato Black Rot Pathogen Ceratocystis fimbriata

Black rot, caused by the soilborne fungus Ceratocystis fimbriata, is a major postharvest disease of sweetpotato (Ipomoea batatas) worldwide. Recent genomic and epidemiological studies have advanced our understanding of the interactions among host, pathogen and environment that influence disease development. Here, we review current knowledge of the pathogen's biology, epidemiology, virulence and management, and identify priorities for future research. TAXONOMY: Class: Sordariomycetes; Subclass: Hypocreomycetidae; Order: Microascales; Family: Ceratocystidaceae; Genus: Ceratocystis; Species: Ceratocystis fimbriata. HOST RANGE: Ceratocystis fimbriata sensu stricto is the sweetpotato-associated species. The broader host range historically attributed to C. fimbriata reflects the C. fimbriata sensu lato species complex, which included host-associated lineages now recognized as distinct Ceratocystis taxa. DISEASE SYMPTOMS: Latent infections of storage roots evolve into firm, greenish-black cortical lesions bearing protruding perithecia; foliar wilting and stunting can occur in the field. DISEASE CONTROL: Integrated measures, including pathogen-free slips, gentle harvesting, curing, cold storage, sanitation, fungicide dips and emerging microbial biological control strategies, provide partial control; host resistance remains an important breeding target. USEFUL WEBSITES: https://plantpathology.ces.ncsu.edu-diagnostic fact sheets; https://vegetables.tennessee.edu-Southeastern U.S. Vegetable Handbook.