Behavioral and EAG Synergism of Varous Compounds to Dipropyl Disulfide in the Ovipositional Attraction of the Onion Fly : Hylemya antiqua MEIGEN : Diptera : Anthomyiidae

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Twnety-eight derivatives of dipropyl disulfide and ethyl acetate were screened for ovipositional attractancy and EAG responses of the onion fly. There was no correlation between the fly's EAG responses and the ovipositional attractancy of the tested compounds. Ethanol, propanol, methyl acetate, dipropyl ether and propyl chloride, which more or less resemble the disulfide in their physico-chemical characteristics, could synergize the disulfide at certain mixing rations. Further EAG studies with these synergistic mixtures suggested that ethyl acetate works on the same sensillum and receptor sites as the disulfide to synergize the ovipositional attractancy. Propanol, on the other hand, was postulated to stimulate a separate sensillum from that of the disulfide, because the EAG response to the mixture was additive. The ternary mixtures of the synergistic compounds and the disulfide, however, did not yield any attractancy in spite of causing the highest EAG responses, which were formulated as such. It was concluded that the EAG provides no adequate means for screening the attractive compounds and their mixtures.