الفهرس 
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Abstract
The current study aimed to demonstrate the diseases that affect leafy and flower ornamental plants, and focused on the plants in Giza, Qalyubia and Alexandria, as well as to uncover the causes of these fungal diseases and the most important ways to control them. The percent infection of Coleus blumei in Giza ranged between 35-40%, Salvia splendens recorded (22-24%) and Begonia wax (20-22%), and the high rate of infection in Giza, followed Qalyubia governorate. Also, the frequency of isolated fungi varied according to the plants tested i.e Bedding plants, Coleus blumei, Salvia splendens & Begonia wax. Infection tests confirmed that the fungi F. oxysporum, F. solani, P. ultimu, M. phaseolina, R. solani and S. sclerotiorum were the most capable to infect previous plants and causing significant greenhouse losses. The aqueous, extract of Citronella leaves, extracts of the flower buds of cloves, were the highest effect whereas thyme and two crosses were the least effect. Experiments have shown that Clove oil was the most effective oil. Biocides test showed that the effect ratio varied according to the type of biocide used and the best was the pesticide (Milgo) and the least affected was (Plant Guard) as it led to a decrease of 7.78% for the fungi F. oxysporum, P. ultimum& M. phaseolina. Immersion of the tested seedlings in the aqueous leaf extract of Citronella and buds (Clove) significantly decreased the percentage of wilt and root rot and increased the percentage of the remaining plants. Clove oils and Citronella exceeded the rest of the other treatments in reducing the percentage of infection when immersing the roots of seedlings in volatile essential oils before planting for 30 minutes. Immersion of the cascades in Milgo, Rhizo-N was the best efficacy in reducing the incidence of root rot and wilt. Immersion of seedlings in the Softguard (Chitosan 2%) at a concentration of 3.00 mL / L of water for 30 minutes resulted in the highest significant decrease in the percentage of infection of the seedlings. It turned out that the solution of Copper nanoparticles Oxide at a concentration of 300 mg/L, significantly reduced the incidence of root rot and wilt diseases compared with the solution of nanoparticle Zinc Oxide. Uniform 446 SE fungicide showed the best efficacy against wilt and root rot diseases. The ratio of basic components of each of the plants (Coleus blumei, Salvia splendens & Begonia wax) was affected with the treatment with Clove oils resulted in a significant increase in the percentage of free Phenols by 33%, however, it resulted in a 2.84% increase in the associated phenols.
Key words: Citronella extract, Clove oils, biocides Milgo & Rhizo-N, Softguard Chitosan 2%, Copper nanoparticles Oxide & Zine Oxide nanoparticles, Uniform 446 SE fungicide, Chemical analysis, Bedding plants (Coleus blumei, Salvia splendens & Begonia wax).