الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Potato Solanum Tuberosum L. Is One of The Major Solanaceous Crops .It Is Considered To Be One Of The Most Important Vegetable Crops In Egypt . Potato Production Approximately 2600.000 Tons Is Produced from An Area Of About 252.000 Faddan . Potato Brown Rot Is Caused By The Bacterium Ralstonia Solanacearum Race 3 Biovar 2. It Presents A Major Threat To The Potato Production World Wide Particularly In Warm Growing Area Such As The Mediterranean Region . Brown Rot Is Caused By The Bacterium Ralstonia Solanacearum Race 3 Biovar 2. It Present A Major Threat to the potato production worldwide particularly in warm growing areas such as the mediterranean region . Brown rot infections can be very destructive and cause considerable Yield Losses . Hayward 1964 and engelbrecht and Hattingh 1989 differentiated strains Of Ralstonia solanacearum into four biovars according to their ability to oxidize three disaccharides and three hexose alcohols.