METHODE ZUR BEKAEMPFUNG VON AKARID-SCHAEDLINGEN DURCH VERWENDUNG VON OXYIMINO-SUBSTITUIERTEN CYCLOPROPANCARBONSAEURE-ESTERN, SOWIE DIE ZISOMEREN VON GEWISSEN DIESER ESTER

(IR,cis)-Esters of the following general formula have pesticidal insects and acarids activity. wherein R represents a hydrogen atom, an alkyl group containing from 1 to 10 carbon atoms optionally substituted by one or more halogen atoms, a (cycloalkyl)-alkyl group containing 3 to 7 ring carbon atoms, a total of 4 to 9 carbon atoms and optionally ring-substituted by one or more halogen atoms, a cycloalkyl group containing 3 to 7 ring carbon atoms, an alkenyl group containing 2 to 4 carbon atoms optionally substituted by one or more halogen atoms or alkynyl group containing 2 to 4 carbon atoms or an aryl group containing 6 to 12 carbon atoms or an aralkyl group containing 7 to 10 carbon atoms, each optionally ring-substituted by one or more halogen atoms; R is the residue of a pyrethroid alcohol, e.g. 3-phenoxybenzyl alcohol, alphacyano-3-phenoxybenzyl alcohol or 5-benzyl-3-furylmethyl alcohol. Of the (IR,cis)-esters, the Z-isomer form gives rise to better pesticidal activity. Novel intermediates in the form of the free acid, its salts, halides and alkyl esters are also disclosed.