TRANS-CERALURE ISOMERS - DIFFERENCES IN ATTRACTION FOR MEDITERRANEAN FRUIT-FLY, CERATITIS-CAPITATA (WIED) (DIPTERA, TEPHRITIDAE)

Differences in attractiveness of four individual trans isomers of cera lure (CRL) [ethyl 4- (and 5-) iodo-trans-2-methylcyclohexane-1-carboxy late] for male Mediterranean fruit fly, Ceratitis capitata (Wiedemann) , were investigated. One of the isomers, CRL-B1 (ethyl is-5-iodo-trans -2-methylcyclohexane-1-carboxylate) was significantly superior to the three other trans-CRL isomers, CRL, trimedlure (TML) [1,1-dimethylethy l 4- (and 5-) chloro-trans-2-methylcyclohexane-1-carboxylate], and TML -C (1,1-dimethylethyl -4-chloro-trans-2-methylcyclohexane-1-carboxylat e) on an equal weight basis.