Alternaria species associated with mouldy heart on peaches in Argentina

GRACIELA N. POSE , VANESA LUDEMANN, DAMIÁN FERNANDEZ, JUAN A. SEGURA, VIRGINIA FERNÁNDEZ PINTO.

TROPICAL PLANT PATHOLOGY

Sociedade Brasileira de Fitopatologia

Lugar: Brasilia; Año: 2010 vol. 33 p. 174 - 177

1983-2052

Abstract ‘Mouldy heart’ caused by Alternaria spp has been previously reported in apples in Argentina but in our knowledge this is the first report of Alternaria spp in‘mouldy heart’ affected peaches in our country. Direct isolation of Alternaria species was performed on Dichloran-Chloramphenicol-Malt Extract-Agar. Seven strains were isolated and identified according to Ellis, 1971 as A. alternata and one as A. tenuissima. Their toxicogenic potential (AOH, AME and TA production) was determined. The toxins were extracted with chloroform and determined by TLC. All strains produced AOH and AME while six of them were TA producers. The fungicides tested were Captan and Mancozeb. At 2.5g/l (commercial concentration) both fungicides inhibited the germination of spores. Captan completely inhibited fungi development The effect on toxin production was variable with regards to fungicide type, doses, strains and toxins considered.