FUNGICIDAL ACTIVITY OF SOME ORGANOTIN COMPOUNDS AGAINST CERATOCYSTIS-URMI

Three series of organotin compounds were screened in vitro against Cer atocystis ulmi, the causative agent of Dutch elm disease, The series t hat were most active against this deadly fungus were those that contai ned the triphenyltin moiety. In addition, the fungicidal activity of t he triphenyltin compounds were found to be independent of the anionic group attached to the tin atom. However, there was a marked increase i n the activity of the triphenyltins when a biologically active group w hich did not dissociate upon dissolution was incorporated into the ove rall molecule.