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Abstract
This work was conducted to study Ralstonia solanacearum the causative agent of brown rot disease of some crops including potato in different governorates under Egyptian conditions. Typical syndromes for Beheria were the most affected. Pathogenicity test and morphological characteristic can detect the most susceptible potato plants. All isolates were tested with Biolog system, and indirect immunofluoresent technique (IF), Biovars and races can also be detected. King´sB medium was the most effective medium in the most treatments. Using of Antibiotics as Streptomycin was a good inhibitor for the bacteria growth compered with Pencilin and Ampicilin. Sailicylic acid, di-potassium hydrogen phosphate, Potassium nitrate and hydrogen peroxide respectively were more effective on reducing disease severity.Agro-compounds like Potassin, Phosphorin, and acrobat- copper showed significant differences in disease reduction. Combination between antibiotics. chemical compounds and some agro compounds in formulas were decreased the severity of brown rot and increased yield of potato.
Key words :- Potato –Brown rot – Ralstonia solanacearum –Biological control – Antibiotics – Chemical compounds – Agro compounds –Induced resistance- IPM.