Fusarium poae pathogenicity and mycotoxin accumulation on selected wheat and barley genotypes at a single location in Argentina

STENGLEIN S.A.; DINOLFO, MI; BARROS, G; BONGIORNO, F.; CHULZE S; MORENO MV

PLANT DISEASE

AMER PHYTOPATHOLOGICAL SOC

Año: 2014 vol. 98 p. 1733 - 1738

0191-2917

Fusarium poae is a relatively weak pathogen with increasing importance in cereal grains principally due to its capacity to produce several mycotoxins. In this study we evaluated the pathogenicity and toxin accumulation of individually F. poae isolates on wheat and barley under natural conditions for three 3 years. Analysis of variance showed demonstrated significant differences for year x genotype, year x isolate, genotype x isolate, and year x genotype x isolate interactions for both incidence anddisease severity. Based on cContrast analysises, showed that Apogee genotype was more susceptible than the other wheat genotypes evaluated, that wheat genotypes were more susceptible than barley genotypes evaluated, that durum wheat genotypes were more susceptible than bread wheat genotypes evaluated, and that barley genotype Scarlett presents had greatermore symptom development per spike than the other barley genotypes tested. Neither HT-2 nor T-2 toxins were detected in the grain samples. However, high levels of nivalenol were found in both wheat and barley samples. The increased reported isolation of F. poae from wheat and barley, and the high capacity to produce nivalenol of this fungus underlies the needs of more studies on F. poae-host interactions, especially for barley.