Isolates of Aspergillus flavus obtained from a new growing peanut region in Argentina (Formosa province) were examined
for aflatoxin types B and G and cyclopiazonic acid (CPA) production. Sclerotia diameters and the number of sclerotia produced
per square centimetre were also determined for each isolate. They were tested by vegetative compatibility group analysis to
investigate their genetic relatedness and correlate the results with vegetative compatibility groups previously described from the
major peanut-growing area (Co´rdoba province) in our country. Two isolates were considered atypical because they
simultaneously produce aflatoxins B and G and CPA.
A. flavus population from Formosa province was very diverse genetically. Vegetative compatibility groups (VCGs) formed
by typical isolations of A. flavus were different among agroecological sites. Formosa isolates could not be grouped to any of the
Co´rdoba VCGs, while that one of the VCGs that contain atypical isolates included strains from the two geographical regions.
Each VCG included isolates of the same mycotoxin and sclerotia production pattern. The two regions analysed have different
climatic conditions, soil type, crop sequence history and also are in different latitude. These parameters may reflect different
geographic adaptation between isolates from both sites.
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