Linear growth of Alternaria porri (Ellis) Ciferri. was significantly reduced after 5 days with Ridomil plus 50% and Ridomil M 72 respectively. The same trend was observed with spore germination A. porri. Also, Trichoderma hamutum was the best antagonistic fungi in reducing the linear growth of A. porri compared control followed by Trichoderma harizianum and T. viride, while, Glicoladium roseum gave a moderate inhibition while, antagonistic bacteria gave highly inhibition. Bacillus subtilus gave high inhibition compared control.On the other hand, the tested essential oils inhibited in linear growth of A. porri at all tested concentrations compared with untreated control. Cinnamon, mint and clove oils gave the highest inhibited the linear growth of the pathogenic fungus, respectively followed by camphor and thyme.
Under greenhouse and field conditions, observed that disease incidence, disease severity and yield (Ton/feddan).Ridomil plus 50% and Ridomil M-72 gave great inhibition were determined to pathogen compared with control and other fungicides while, the some bioagents (fungi and bacteria) decreased disease incidence and disease severity T. hamutum and B. subtilus were best treatments on controlling pathogen other treatments. Also, the yield (Ton/feddan) was the high yield were observed in the same treatments. Effect of someessential oils, gave highly inhibition of disease incidence and disease severity as well as yield (Ton/feddan). The mint and clove were the best compared with control and other treatments.