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DOI: 10.3852/07-174R
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Mycologia, 100(3), 2008, pp. 353-374.
© 2008 by The Mycological Society of America

Colletotrichum acutatum var. fioriniae (teleomorph: Glomerella acutata var. fioriniae var. nov.) infection of a scale insect


Jose Marcelino 1

     Department of Plant and Soil Science, Entomology Research Laboratory, University of Vermont, 661 Spear Street, Burlington, Vermont 05405

Rosanna Giordano

     Illinois Natural History Survey, Division of Biodiversity and Ecological Entomology, 1816 S. Oak Street, Champaign, Illinois 61820

Svetlana Gouli
Vladimir Gouli
Bruce L. Parker
Margaret Skinner

     Entomology Research Laboratory, University of Vermont, 661 Spear Street, Burlington, Vermont 05405

David TeBeest

     Department of Plant Pathology, Plant Science Building, University of Arkansas, Fayetteville, Arkansas 72701

Roberto Cesnik

     EMBRAPA - Embrapa Meio Ambiente, CP 69, CEP 13820-000, Jaguariúna-SP, Brazil

An epizootic has been reported in Fiorinia externa populations in New York, Connecticut, Pennsylvania and New Jersey. Infected insects have profuse sclerotial masses enclosing their bodies. The most commonly isolated microorganism from infected F. externa was Colletotrichum sp. A morphological and molecular characterization of this fungus indicated that it is closely related to phytopathogenic C. acutatum isolates. Isolates of Colletotrichum sp. from F. externa in areas of the epizootic were similar genetically and were named Colletotrichum acutatum var. fioriniae var. nov. based on our findings. In vitro and in planta mating observed between isolates of C. acutatum var. fioriniae could serve as a possible source of genetic variation and might give rise to new biotypes with a propensity to infect insects. Only one other strain, C. gloeosporioides f. sp. ortheziidae, has been reported to show entomopathogenic activity.

Key words: Colletotrichum acutatum var. fioriniae, entomopathogenic fungi, epizootic, Fiorinia externa

1 Corresponding author. E-mail: jmarcelino{at}uac.pt






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Copyright © 2008 by The Mycological Society of America.