Abstract
20 compounds were tested to detn. their effect on the concn. of tobacco mosaic virus in tobacco stem tissue cultures. Only one compound, indolebutyric acid, was found to have an effect on the virus content at the listed concns. IBA at 100 mg./l. not only was effective in reducing the virus concn. of the tissue cultures, but also (due to its action as a synthetic plant growth hormone) increased the terminal weight of the treated cultures to at least 2 times that of the controls.