POPULATION-STRUCTURE OF WHEAT BROWN RUST AGENT .3. ESTIMATION OF POPULATIONS SIMILARITY RATE ON THE TERRITORY OF CIS (COMMONWEALTH-OF-INDEPENDENT-STATES) IN 1988-1990

The Puccinia recondita f. sp. tritici phenotype composition was invest igated in European and Asian parts of CIS (Former USSR). The dominant phenotypes in geographical samples of populations and degree of simila rity of phenotype frequency were determined. It was supposed the possi bility of isolation between pathogen population inhabiting on Caucasus , European, Eastern Syberia and Northern Kazachstan, Middle Asia regio ns. The approaches to determination of population areas and spore migr ation are discussed.