Resumo

GONZALEZ MORALES, Susana; FLORES LOPEZ, María Liliana; BENAVIDES MENDOZA, Adalberto  e  FLORES OLIVAS, Alberto. Inhibitory Activity of Heliopsis longipes Extract on Fusarium oxysporum f. sp lycopersici. Rev. mex. fitopatol [online]. 2011, vol.29, n.2, pp.146-153. ISSN 2007-8080.

A total of 17 Fusarium sp. isolates were obtained from tomato roots with wilt symptoms. Nine isolates were identified as Fusarium oxysporum f. sp. lycopersici; isolates pathogenicity was determined. More severe symptoms were caused by one of the isolates named FOL 10. Such isolate was selected to have the Heliopsis longipes ethanol extract minimum inhibitory dose evaluated in vitro. The affinin concentration was determined as the extract main component. The estimated median lethal dose was 164.2 μg mL^-1 of affinin, and the lethal dose 90 was 348.6 μg mL^-1 of affinin.

Palavras-chave : Affinin; median lethal dose; tomato.

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