COMPARISON OF MEDIA FOR THE ISOLATION OF FUSARIUM OXYSPORUM F. SP. LYCOPERSICI FROM SAWDUST USED FOR GROWING TOMATOES

Various agar media amended with antimicrobial agents were compared for the selective isolation of Fusarium oxysporum f.sp. lycopersici from sawdust used for growing greenhouse tomatoes (Lycopersicon esculentum Mill.). Potato dextrose agar amended with pentachloronitrobenzene (PCNB) (500 mg/l) and streptomycin sulphate (300 mg/l proved to be the most satisfactory medium, tested. These antimicrobial agents, unlike rose bengal, did not reduce the number of Fusarium colonies isolated.