Fungicidal Activity of Some Organotin Compounds againstCeratocystis ulmi

Abstract

Three series of organotin compounds were screened in vitro against Ceratocystis ulmi, the causative agent of Dutch elm disease. The series that were most active against this deadly fungus were those that contained the triphenyltin moiety. In addition, the fungicidal activity of the triphenyltin compounds were found to be independent of the anionic group attached to the tin atom. However, there was a marked increase in the activity of the triphenyltins when a biologically active group which did not dissociate upon dissolution was incorporated into the overall molecule.