ToxigenicFusariumSpecies Found in Roots and Rhizospheres ofBaccharisSpecies From Brazil

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Abstract
Fusarium species were more abundant in the rhizosphere than in roots or soil of Baccharis species collected in southern Brazil. Fusarium sporotrichioides occurred more abundantly in roots and rhizospheres than in soil surrounding roots. More Fusarium species were isolated from B. coridifolia than from four other Baccharis species [B. megapotamica, B. myriocephala, B. semiserrata, B. uncinella]. Thirty-nine isolates of F. oxysporum and 42 of F. sporotrichioides from roots, rhizospheres, and soil of Baccharis species, grown on rice substrate and fed to rats in a 1:1 mixture with rate ration, caused below-normal weight gains, and 18 of the isolates of the two Fusarium species were lethal to rats in a 5-day test. T-2 toxin was produced by three isolates of F. sporotrichioides.