| abstract |
Novel 3-acyloxy-4-keto-β-ionone derivatives of the formula I ##STR1## wherein Z is either the radical ##STR2## in which R 1 represents C 2 -C 5 alkyl, C 1 -C 5 alkoxy-C 1 -C 5 alkyl having a maximum number of 6 carbon atoms, cyclopropyl or cyclopropyl which is substituted by methyl or by halogen or represents the radical ##STR3## wherein R 2 represents C 1 -C 5 alkyl, C 1 -C 5 alkoxy-C 1 -C 5 alkyl having a maximum number of 6 carbon atoms, cyclopropyl or cyclopropyl which is substituted by methyl or by halogen and X represents either oxygen or sulphur, and ##STR4## display very effective microbicidal activity. They can especially be used in microbicidal compositions to control plant-pathogenic microorganisms, preferably fungi of the order Oomycetes. |