title: Electroantennogram responses of mediterranean fruit fly,Ceratitis capitata (Diptera: Tephritidae) to trimedlure and itstrans isomers.
abstract: Electroantennograms (EAGs) of unmated laboratory-reared male and femaleCeratitis capitata (Wiedemann) were recorded in response to the attractant trimedlure [tert-butyl 4(and 5)-chloro-trans-2-methylcyclohexane-1-carboxylate] and its fourtrans isomers. For both sexes, the magnitude of the EAG response was relatively low as compared to other previously tested compounds (i.e., plant volatiles). Dosage-response curves generated for all TML isomers revealed that flies responded to increasing dosages over a relatively narrow range (two to three log steps). Responses for both sexes peaked at ca. 10 μg dose for all isomers. Antennal response in males was greatest to the C isomer followed by the B1, A, and B2 isomers, while responses of females were greatest for the A isomer followed by B1, C, and B2. Both sexes exhibited a long recovery period for the response potential to return to baseline at doses above 1 μg for all of the isomers tested, except for B2. The low EAG sensitivity to trimedlure and the apparent EAG selectivity to the C isomer in males are discussed in relation to the known field attractancy of males to the C, A, B1, and B2 isomers.
authors.affiliation: USDA-ARS Tropical Fruit and Vegetable Research Laboratory, P. 0. Box 4459, 96720, Hilo, Hawaii.
authors.forename: E B
authors.initials: EB
authors.lastname: Jang
authors.forename: D M
authors.initials: DM
authors.lastname: Light
authors.forename: J C
authors.initials: JC
authors.lastname: Dickens
authors.forename: T P
authors.initials: TP
authors.lastname: McGovern
authors.forename: J T
authors.initials: JT
authors.lastname: Nagata