Serological Differentiation AmongFormae Specialesand Physiological Races ofFusarium Oxysporum

Abstract
Four formae speciales of F, oxysporum (dianthi, melonis, pisi, lycopersici) and three physiological races (1, 2, 3) of F. oxysporum f.sp. melonis have been differentiated using specific antisera and the techniques of double diffusion and radio double diffusion in agar. Three isolates of F. oxysporum f.sp. dianthi race 2 and 10 of f.sp. lycopersici race 1 tested against the appropriate antisera reacted the same within each race.