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. 2024 Oct;80(10):5353-5363.
doi: 10.1002/ps.8264. Epub 2024 Jun 28.

Inhibitory activity of some short-chain aliphatic aldehydes on pheromone and ammonium carbonate-mediated attraction in olive fruit fly, Bactrocera oleae

Giacinto Salvatore Germinara  1 , Onofrio Marco Pistillo  1 , Ilaria D'Isita  1 , Antonella Marta Di Palma  1 , Giuseppe Rotundo  1   2 , Matteo Guidotti  3 , Rinaldo Psaro  3 , Alessandro Caselli  3   4 , Stefano Econdi  3   4 , Elisabetta Gargani  5 , Ilaria Cutino  5 , Claudia Benvenuti  5 , Pio Federico Roversi  5
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Free article

Inhibitory activity of some short-chain aliphatic aldehydes on pheromone and ammonium carbonate-mediated attraction in olive fruit fly, Bactrocera oleae

Giacinto Salvatore Germinara et al. Pest Manag Sci. 2024 Oct.
Free article

Abstract

Background: The olive fruit fly (OFF), Bactrocera oleae (Rossi), is the main insect pest of olive trees worldwide. Legislation limits to the use of some synthetic larvicidal insecticides is leading to the development of new control options for preventive control of adult flies. In the present study, the biological activity of four short-chain aliphatic aldehydes, namely hexanal, (E)-2-hexenal, heptanal and (E)-2-heptenal, previously reported as repellents to the OFF adults was investigated.

Results: Electroantennography (EAG) recordings showed that antennae of OFF males and females are able to perceive the test compounds in a wide range of doses. In field trapping experiments, reservoir-type polypropylene (PP) membrane dispensers loaded with individual compounds did not elicit a significant attraction of OFF males and females. On the contrary, a significant reduction of male catches was noticed when sex pheromone dispensers and PP membrane dispensers, loaded with one of the test compounds, were applied on the same white sticky traps ≈20 cm apart. Likewise, male and female catches in yellow sticky traps baited with ammonium carbonate (AC) dispensers as food attractant were significantly reduced by the presence of PP membrane dispensers of individual aliphatic aldehydes on the same traps. In small plots control trials, solid formulations of the four aldehydes into a bentonite clay support induced a significant reduction of the OFF active infestation mainly when C6 and C7 aldehyde-activated bentonites were used.

Conclusion: Short-chain aliphatic aldehydes showed inhibitory effects on sex pheromone and food attractant-mediated attraction of OFF. Results of field trials suggest potential of short-chain aliphatic aldehydes to develop new semiochemical-based OFF control options. © 2024 Society of Chemical Industry.

Keywords: EAG; bentonite activation; inert dusts; pheromone inhibition; repellent; semiochemical slow‐release dispensers.

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References

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