DIAGNOSIS OF Fusarium oxysporum FUNGUS ISOLATIONS AND EVALUATION OF THE EFFICIENCY OF THE BACTERIA Bacillus subtilis AND POTASSIUM PHOSPHATE IN THE INHIBITION OF FUNGI F.oxysporum f.sp. cucumerinum and F.oxysporum f.sp. melonis

Abstract

Abstract The study aimed to isolate and diagnose types of Fusarium oxysporum from the roots of cucumbers and melons plants infected , from the fields of Al- Ssaouira, Al-Numaniya and Al-Hai in Wasit Governorate , and the possibility to control it by using the bacteria Bacillus subtilis and potassium phosphate concentration (500) mg / liter of water. Were obtained on (19) pure isolates of fungus F.oxysporum f.sp. cucumerinum and (11) pure isolates of F.oxysporum f.sp. melonis . The isolate F.oxysporum f.sp. cucumerinum (FOS 9) showed a high virulence than the rest isolates , white the isolates F.oxysporum f.sp. melonis (FOM 2) showed a high virulence than the rest isolates . The bacteria B.subtilis showed high antibiosis activity against F. oxysporum f.sp. cucumerinum and F.oxysporum f.sp. melonis and recorded (87.0%) and (92.5%) respectively.