الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Recently, El-sharkia cultivated Sweet charlie and Festival cultivar of strawberry, (Fragaria x ananassa Duch.), greatly suffered from widely distributed diseases doubted to be due to root and crown rots.Fusarium solani (Mart.) Sacc. and Rhizoctonia solani Kühn were detected beyond any doubted to incite the disease. This detection was confirmed by Agriculture Research Center, Giza. In general, under plastic-house conditions, plant guard was the most effective biocide recorded in case of either Sweet charlie or Festival that were planted in F. solani or R. solani infested soil, respectively. However, Rhizo N was better than plant guard when Festival cultivar was transplanted in soil infested with R. solani under field conditions. Plant guard was the best biocide followed by Rhizo N and lastly promot conducted in field experiments for both. All prior cultivation treatments simultaneously enhanced polyphenol oxidase and peroxidase activities under plastic-house conditions.The inhibitory effect of garlic plant extract in vitro recorded the highest reduction of mycelial growth followed by onion plant extract and then camphor while data of plastic-house indicated also that garlic plant extract was most effective extract to reduce disease incidence followed by onion and finally camphor. Similar results to the above treated application of garlic extract were superior in controlling root and crown rot followed by onion whereas camphor was the least effective one.Under plastic-house or field conditions, salicylic acid was proved to be the best effective chemical inducers to minimize disease incidence followed by ascorbic acid and then the lowest was citric acid. Rhizolex T followed by Topsin M sharply decreased the mycelial growth of the pathogenic fungi in vitro and significantly reduced infection percentage and disease severity compared with the control treatment in vivo.