ANTAGONISTIC ACTIVITY IN FUSARIUM-ACUMINATUM

Ten of 19 (53%) tested isolates of Fusarium acuminatum, from different geographical origins and sources, showed in vitro antagonistic activi ty (inhibition at distance) to mycelial growth of F. moniliforme. More over, when F. acuminatum ITEM-728 was rested against 25 different fung al species, an initial inhibition at a distance was observed which was followed by the spread of the F. acuminatum mycelium over the opposit e fungal colony to various degrees. Most of the F. acuminatum isolates which showed antagonistic activity proved to be enniatin B (EB) produ cers, and some of them also formed moniliformin (MF). The toxic activi ty of the methanol extract of F. acuminatum ITEM-728 rewards some test microorganisms was closely related to the EB concentration. In partic ular, Bacillus subtilis proved to be a very sensitive lest microorgani sm.