Control or repellency of mosquitoes is accomplished by bringing the insects into contact with at least one of the compounds of the structure (I)whereinR is selected from —OH, ═O, —OC(O)R4, —OR6, —(OR6)2, wherein each R6 is independently selected from an alkyl group containing from 1 to 4 carbon atoms and R4 is a branched or straight chain, saturated or unsaturated hydrocarbyl group with zero to two double bonds and from 1 to 15 carbon atoms；X is O or CH2, with the proviso that when X is O R can only be ═O；each Z is independently selected from (CH) and (CH2)；y is a numeral selected from 1 and 2；R1 is selected from H or a branched or straight chain, saturated or unsaturated hydrocarbyl group with zero to two double bonds and from 1 to 15 carbon atoms；R2 is selected from H and a branched or straight chain, saturated or unsaturated hydrocarbyl group with zero to three double bonds and from 1 to 15 carbon atoms；R3 is selected from the group consisting of H and a branched or straight chain, saturated or unsaturated hydrocarbyl group with zero to three double bonds and from 1 to 15 carbon atoms, —(CH2)nOH, —C(O)OR5, —CH2C(O)OR7, —CH2C(O)R8, —C(O)NR9R10, —CH2C(O)NR11R12 where each of R5, R7, R8, R9, R10, R11 and R12 is independently selected from H and a branched or straight chain, saturated or unsaturated hydrocarbyl group with zero to three double bonds and from 1 to 15 carbon atoms and n is an integer of from 1 to 12；the bond between the 2 and 3 positions in the ring structure may be a single or a double bond； andwherein the compounds of structure (I) contain from 11 to 20 total carbon atoms in the compounds, with the proviso that when R is ═O, X is CH2, Z is CH2, y is 1 R2 is H, and R3 is CH2C(O)OR7 then the total number of carbon atoms in the compounds of structure (I) is from 15 to 20 carbon atoms, and when X is O and R is ═O the total number of carbon atoms in the compounds of structure (I) is from 11 to 17 carbon atoms. The invention also includes optical isomer
