INTRASPECIFIC DIVERSITY OF PHYTOPATHOGENIC FUNGUS <i>FUSARIUM GRAMINEARUM</i>
<i>Fusarium graminearum</i> is the most widespread and destructive pathogen causing <i>Fusarium</i> head blight (FHB) of small-grain cereals worldwide. The tortuous act of the pathogen is aggravated because of its ability at biosynthesis of metabolites accumulated in infected grains and toxic for human and animals. Trichothecenes are the best investigated dominant mycotoxins. This review summarizes literature data of genetic diversity among isolates within populations of diverse geographic localizations. Molecular-genetic base for the subdivision of trichothecene-producing isolates on chemotypes and its genotyping are considered. Data about <i>F. graminearum</i> as a complex of phylogenetic lineages as well as distribution and chemotypes of these lineages on different continents are discussed.