Tomato varieties Santa Cruz and S-34 varieties were used as differentials varieties, to investigate physiologic races of Fusarium oxysporum f. lycopersici (Wr) Sny & Hans. Seven Pernambuco isolates of the pathogen were used in inoculation testes conducted under green-house with parcial control of temperature. The authors concluded that all seven isolates presented as race 1, and there was variation in pathogenic among their.