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Characterization of a Vascular Wilt of Erythroxylum coca Caused by Fusarium oxysporum f. sp. erythroxyli Forma Specialis Nova

May 1997 , Volume 81 , Number  5
Pages  501 - 504

D. C. Sands , E. J. Ford , R. V. Miller , B. K. Sally , M. K. McCarthy , T. W. Anderson , M. B. Weaver , C. T. Morgan , and A. L. Pilgeram , Department of Plant Pathology, Montana State University, Bozeman 59717 ; and L. C. Darlington , Biocontrol of Plant Diseases Laboratory, USDA, ARS, Beltsville, MD 20705

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Accepted for publication 3 February 1997.

A new forma specialis of Fusarium oxysporum (F. oxysporum f. sp. erythroxyli) pathogenic to Erythroxylum coca and E. novogranatense is described. The pathogen was isolated from the vascular tissue of diseased plants from an Erythroxylum plantation in Hawaii. This pathogen causes vascular wilt symptoms and death in both E. coca and E. novogranatense plants as soon as 7 weeks after soil infestation. The pathogenicity of seven isolates from the affected field was determined in field and growth-chamber studies. Genetic variation was not detected among the seven Hawaiian isolates, using arbitrarily primed polymerase chain reaction. The seven isolates could be differentiated from a strain isolated from a diseased E. coca plant from South America. All Hawaiian isolates and the South American isolate belonged to a single vegetative compatibility group.

Additional keywords: DNA, mycoherbicide, RAPD

© 1997 The American Phytopathological Society