Tomato (Solanum lycopersicum L.) plants are susceptible to infection by Sclerotium rolfsii, causing damping-off of nursery seedlings as well as crown rot in adult plants. Effect of onion and garlic extracts, neem oil, salicylic, ascorbic, citric acids and hydrogen peroxide and some bioagents such as Bacillus subtilis, Pseudomonas fluorescens, Saccharomyces cerevisiae and Trichoderma harzianum on the linear growth of the pathogen was studied. Neem oil, salicylic acid and P. fluorescens came in the first rank and recorded the best values of reducing disease incidence and severity followed by B. subtilis furthermore, decreasing the linear growth of Sclerotium rolfsii. Onion extract, citric and ascorbic acids recorded the lowest values in this respect.