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Abstract
Disease survey indicated that the most incidence of the disease was observed in Gharbiya governorates. Clear differences among C. maydis cultures grown on PDAY were found with respect to their radial growth and sporulation rates. The majority of isolates showed whitish grey and white colour, had rhizoid margin and displayed intermediate growth density. All the tested isolates were pathogenic and differed in their aggressiveness. Different levels of genetic variability were recorded among the tested isolates. SC.10 and TWC.329 hybrids showed the highest degree of tolerance to C. maydis infection. The high activity of PO, PPO and PAL enzymes was recorded in tolerant hybrids sown in infested soil. In vitro, three Bacillus subtilis and one Pseudomonas fluorescens isolates as well as compost-tea, OMW and humic acid showed antifungal activity against C. maydis. field conditions