Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2006.904.910Streptomyces Isolates on Rhizoctonia solani, the Causal Agent of Damping-off of Sugar Beet]]>A.Sadeghi, A.R. Hessan H. Askari S. Aghighi G.H. Shahidi Bonjar 5200695Biological control of sugar beet damping-off of Rhizoctonia solani by two Streptomyces isolates (S2 and C) was evaluated in this study. The in vitro antagonism assays showed that active isolates had inhibitory effects on mycelium growth of the three R. solani AG-4 isolates (Rs1, Rs2 and Rs3). Soil treatment either with isolate S2 or C formulation inhibited the disease completely and increased seedling stand in infected and uninfected treatments significantly (p<0.05). Compared to controls, all treatments containing bacteria had enhanced shoot and root dry weight and root density. Both bacterial isolates maintained normal growth in pH ranges of 5.6, 7.2 and 8.0 at 29°C. 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