Novel esters in all possible isomeric forms and mixtures thereof of the formula ##STR1## wherein A is selected from the group consisting of ##STR2## R is selected from the group consisting of hydrogen, --CN and --C.tbd.CH, Y is selected from the group consisting of oxygen and sulfur, Z is selected from the group consisting of alkyl and alkoxy of 1 to 4 carbon atoms, alkylthio and alkylsulfonyl of 1 to 4 carbon atoms, cycloalkyl of 3 to 4 carbon atoms, 3,4-methylenedioxy, chlorine, fluorine and bromine, n is an integer of 0, 1 or 2, Z.sub.1 and Z.sub.2 may both be methyl or Z.sub.1 is hydrogen and Z.sub.2 is ##STR3## R.sub.3 is selected from the group consisting of hydrogen and halogen, R.sub.1 and R.sub.2 are individually alkyl of 1 to 8 carbon atoms or taken together with the carbon they are attached to form cycloalkyl of 3 to 6 carbon atoms or ##STR4## X is selected from the group consisting of oxygen and sulfur, T is at least one member of the group consisting of halogen, alkyl of 1 to 8 carbon atoms, alkoxy of 1 to 8 carbon atoms optionally substituted with at least one halogen and --CF.sub.3 and m is an integer from 0, 1 or 2 having insecticidal activity as well as nematocidal and acaricidal activity.