Identity, pathogenicity, and comparative virulence of Fusarium spp. related to stand declines of leafy spurge (Euphorbia esula) in the Northern Plains

• Published in: Plant disease Vol. 80; no. 12
• Main Author: Caesar, A.J. (USDA, ARS, Montana State University, Bozeman.)
• Format: Journal Article
• Language: English
• Published: 01.12.1996
• Subjects: AUXILIAIRE DE LUTTE BIOLOGIQUE; CONTROL BIOLOGICO; DEPERISSEMENT TERMINAL; DESHERBAGE; DIFERENCIAS BIOLOGICAS; DIFFERENCE BIOLOGIQUE; ENCUESTAS SANITARIAS; ENFERMEDADES FUNGOSAS; ENQUETE PATHOLOGIQUE; ESCARDA; EUPHORBIA ESULA; FUSARIUM OXYSPORUM; FUSARIUM PROLIFERATUM; FUSARIUM SOLANI; IDENTIFICACION; IDENTIFICATION; LUTTE BIOLOGIQUE; MALADIE FONGIQUE; MARCHITEZ DESCENDENTE; ORGANISMOS PARA CONTROL BIOLOGICO; PATOGENICIDAD; POUVOIR PATHOGENE
• DOI: 10.1094/PD-80-1395
• ISSN: 0191-2917

Strains of Fusarium spp. causing root disease and crown rot on leafy spurge in natural epidemics and in association with stand declines were identified as F. oxysporum, F. solani, and F. proliferatum. These species predominated among Fusarium spp. isolated from stunted and diseased feeder roots and crowns. There were significant differences in virulence for strains among and within each species. Two strains of F. oxysporum belonged to the same vegetative compatibility group. Ten of 11 strains of Fusarium originated from noncropped or wild areas. These results indicate that Fusarium spp. capable of causing disease on leafy spurge vary as to species, virulence, and compatibility group and are found in a number of sites where this troublesome perennial weed occurs