Abstract: Fungicidal compositions for controlling fungus diseases in plants are disclosed. These compositions contain as their active materials compounds and polymers thereof corresponding to the formula: ##STR1## in which Y', Y", Z' and Z" represent a hydrogen atom or an optionally halogenated alkyl radical containing from 1 to 5 carbon atoms. Included within these active materials are the hydrolysates, salts and quaternary salts of these phospholanes. These cyclic phospholanes or phosphites and their hydrolysates are compatible with other commercial fungicides and the compositions disclosed include these compounds above and in combination with such other fungicides.

Abstract: Fungicidal compositions for controlling fungus diseases in plants are disclosed. These compositions contain as their active materials compounds and polymers thereof corresponding to the formula: ##EQU1## in which Y', Y", Z' and Z" represent a hydrogen atom or an optionally halogenated alkyl radical containing from 1 to 5 carbon atoms. Included within these active materials are the hydrolysates, salts and quaternary salts of these phospholanes. These cyclic phospholanes or phosphites and their hydrolysates are compatible with other commercial fungicides and the compositions disclosed include these compounds above and in combination with such other fungicides.