Mycological and mycotoxin survey on wheat during a non epidemic FHB year in Argentina.

RAMIREZ, M.L; OVIEDO, M.S.; FARNOCHI, M.C; CHULZE, S.N

Wageningen,

Congreso; 9 European Fusarium Seminar,; 2006

Plant Resaerch International (PRI)

Fusarium graminearum Schw, perfect stage Gibberella zeae (Schw.) Petch., is the main pathogen associated with Fusarium Head Blight (FHB) in Argentina.During FBH epidemic years deoxynivalenol (DON) was the only toxin reported . A mycological and myxcotoxin contamination survey were carried out during and non epidemic years (harvest season 2003-2004) in Cordoba province, Argentina. Two genera were found as predominant in most of the samples  Fusarium spp and Alternaria spp but the percentages of each of them were dependant of the sample analized. The predominant Fusarium species founded were F. semitectum (section Arthrosporiella); F proliferatum, F. subglutinans F. verticilloides (setion Liseola); F. poae, F. sporotrichioides (section Sporotrichiella) and the less frequent species founded were F. solani (section Martiella) and F. equiseti (sección Gibbosum). The evaluation of DON contamination showed that 48% of the samples analized were positive with low levels ranging between 82- 437 ng/gr. All the samples were negative for NIV contamination. The results suggest a potencial risk to found other Fusarium mycotoxins  on wheat in Argentina.