A Lifetime of a Dispenser-Release Rates of Olive Fruit Fly-Associated Yeast Volatile Compounds and Their Influence on Olive Fruit Fly (Bactrocera oleae Rossi) Attraction

Abstract

The objective of this study was to evaluate the release rate, duration, and biological efficiency of yeast volatile compounds associated with olive fruit flies in slow-release dispensers, polypropylene vials, and rubber septa attached to yellow sticky traps under different environmental conditions in order to protect the environment, humans, and nontarget organisms. Isoamyl alcohol, 2-octanone, and 2-phenethyl acetate were placed in dispensers and tested over a four-week experiment. The weight loss of the volatile compounds in both dispensers was measured, and a rapid, inexpensive, and simple HS-GC/FID method was developed to determine the residual amount of volatiles in the septa. 2-Phenethyl acetate stood out in the rubber septa and showed a statistically significant difference in the release ratio compared to the other volatiles under all conditions tested. Our results showed that the attraction of olive fruit flies increased with decreasing concentrations of the tested volatiles. Regarding the number of flies attracted by rubber septa containing 2-phenethyl acetate, significantly better results were obtained than for septa containing isoamyl alcohol and 2-octanone, in contrast to the attraction of olive fruit flies to polypropylene vials containing these compounds but without significant difference. Since the presence of all tested chemicals was detected during the experiment, this opens the possibility of using more environmentally friendly and cost-effective dispensers with a significantly lower amount of semiochemicals.

Biodegradable electrospun fibers as sustained‐release carriers of insect pheromones for field trapping of Spodoptera litura (Lepidoptera: Noctuidae)

“…Therefore, it can be speculated that the uniform distribution of the hydrophobic sex pheromones reduced the pores and cavities inside the fibers, and slowed the entry of water droplets. The aforementioned speculation is supported by the fiber swelling model posited in recent research conducted by Liu et al 42 Sex pheromones are a class of chemical substances that are easily photolyzed and UV radiation will affect their effectiveness in the field 43 . The light scattering caused by the porous surface of the electrospun film gives it a low transmittance for light >400 nm 44 .…”

“…The aforementioned speculation is supported by the fiber swelling model posited in recent research conducted by Liu et al 42 Sex pheromones are a class of chemical substances that are easily photolyzed and UV radiation will affect their effectiveness in the field. 43 The light scattering caused by the porous surface of the electrospun film gives it a low transmittance for light >400 nm. 44 In the <400 nm UV spectral range, particularly for short-wave UV radiation, the electrospun film exhibited high transmittance.…”