الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Sugar beet plants are often attacked by several pathogens such as fungi, bacteria and viruses which cause great losses in yield. Sclerotium rolfsii Sacc. (Teleomprph: Athelia rolfsii (Curzi) Tu & Kimbrough) a soil-borne plant pathogenic fungi incident of southern sclerotium rot in sugar beet. Algae are one of the chief biological agents that have been studied for the control of fungi plant pathogens. Various strains of cyanobacteria are known to produce intracellular and extracellular metabolites with diverse biological activities such as antibacterial, antifungal and antiviral activity. Plants are very rich sources of bioactive chemical such as phenolic,polyphenols, quinones, flavonoids, flavonols, cumarins, lectins and polypeptides. Some plants yield fraction of essential oils, which have inhibitory effects on microorganisms. They are gaining popularity and drawing the attention of researches globally due to their volatile, biodegradable, eco-friendly, economical and safety characteristics and are easily variable in local environment Algal and plant extract are effective and alternative sources of fungi toxic chemicals showing considerable methods for disease control. Therefore, our study was aimed to: 1- selection of some effective plant extracts and algal species which have antimicrobial activities. 2- Preparation of extracts from these plants and algae in different solvents and testing their antimicrobial activities on the fungus in vit