Behavioral responses of drosophila suzukii (diptera: drosophilidae) to olfactory and visual cues
Selected fruit and leaf volatiles were assessed to determine their attractiveness to Drosophila suzukii Matsumura (Diptera: Drosophilidae). Two- and four-choice assays were conducted in laboratory cages to observe responses of D. suzukii to several doses of compounds individually and in combination. The addition of [beta]-cyclocitral to ethyl hexanoate resulted in a synergistic response from D. suzukii. Additionally, a simple, high concentration blend of isoamyl acetate + [beta]-cyclocitral + methyl butyrate (in equal proportions) is attractive to both sexes of D. suzukii, not attractive to the non-target species Drosophila melanogaster, and is more attractive to females than blueberry fruit. Moreover, methyl isovalerate, methyl butyrate, and ethyl acetate in various combinations with isoamyl acetate + [beta]-cyclocitral were attractive to D. suzukii and not attractive to D. melanogaster. These compounds should be further investigated to determine optimal ratios and blends to develop a more species-specific lure for D. suzukii. Additional behavior assays investigated interactions between visual and olfactory stimuli. Color cues added to blueberry odors resulted in synergistic interactions for red, black, yellow, green and purple. Yeast had an interaction with red and β-cyclocitral had an interaction with yellow. Overall, the odor source influences the behavioral response towards color.
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