###### Abstract  
The foraging behavior of the infective juveniles (IJs) of entomopathogenic nematodes (EPNs) relies on host-derived compounds, but in a tri-trophic context, herbivore-induced root volatiles act as signals enhancing the biological control of insect pests by recruiting EPNs. In southern Chile, the EPN _Steinerrema australe_ exhibits the potential to control the raspberry weevil, _Aegorhinus superillosus_, a key pest of blueberry _Vaccinium corymbosum_. However, there is no information on the quality of the blueberry root volatile plume or the _S. australe_ response to these chemicals as putative attractants. Here, we describe the root volatile profile of blueberries and the chemotaxis behavior of _S. australe_ towards the volatiles identified from _Vaccinium corymbosum_ roots, infested or uninfested with _A. superillosus_ larvae. Among others, we found linalool, \(\alpha\)-terpineol, limonene, eucalypt, 2-carene, 1-nonine, 10-undecyn-1-ol, and methyl salicate in root volatiles and, depending on the level of the emissions, they were selected for bioassays. In the dose-response tests, _S. australe_ was attracted to all five tested concentrations of methyl salicate, 1-nonine, \(\alpha\)-terpineol, and 2-carene, as well as to 100 \(\mu\)mL\({}^{-1}\) of 10-undecyn-1-ol, 0.1 and 100 \(\mu\)g mL\({}^{-1}\) of linalool, and 100 \(\mu\)g mL\({}^{-1}\) of linalone, whereas eucalypt elicited no attraction or repellency. These results suggest that some volatiles released from damaged roots attract _S. australe_ and may have implications for the biocontrol of subterranean pests. root volatiles; belowground interactions; entomopathogenic nematode recruitment; foraging behavior; olfactometer 2023  
[PERSON], [PERSON], R.  
_Asclepias syriaca_ L. (Apocynaceae) [5], citrus grapefruit _Cirrus paradisi_ Macf. (Rutaceae), _Ruta gravelens_ L. (Rutaceae) [8], apple _Malus domestica_ Borkh. (Rosaceae) [9], spotted knappeed _Centaurea stoebe_ L. (Asteraceae) [10], cotton _Gossypium herbaceum_ (Malvaccaee) [11], and tomato _Solanum lycopersicum_ L. (Solanaceae) [12], among others. Given that HIPVs are released as a mixture of compounds, it is important to highlight that some of them could be produced and released by the plant due to herbivory, but others could also be repressed for the same reason [13]. Natural enemies such as predators, parasitoids, and pathogens, including entopmopathogenic nematodes (EPNs), exploit HIPVs in tri-trophic interactions [9; 14; 15; 16] inducing their chemotaxis to chemical-based stimuli [17]. [PERSON] et al. [18] studied the potential of adding (_E_)-\(\beta\)-caryophyllene and pregeijerene to the soil matrix to enhance its attraction to EPNs. In this study, the efficacy of _Steinernema glaseri_ Steiner (Rhabditida: Steinermatidae) was evaluated against the oriental beetle _Anomala orientalis_ Waterhouse (Coleopterara: Scarabaeidae) in a commercial blueberry orchard. The results under laboratory conditions showed that compound (_E_)-\(\beta\)-caryophyllene was significantly more attractive than pregeijerene to EPNs; however, under field conditions, the differences were less meaningful. In another study, [PERSON] et al. [19] reported the ability to produce (_E_)-\(\beta\)-caryophyllene in a non-emitting maize line (transformed with an (_E_)-\(\beta\)-caryophyllene-synthesize gene), resulting in significantly less damage to roots by _Diabrotica virifera virifera_ LeCone (Coleopterara: Chrysomelidae). Research on blueberry VOCs has been mainly focused on the characterization of the fruit aroma [20] and other aboveground structures, such as the flowers and leaves [21; 22]. In Chile, the high-bush blueberry _Vaccinium corymbosum_ (Ericaceae) is an economically important crop, with more than 100,000 tons exported annually. In the country, this crop faces economically important pest problems mainly caused by the native weevil _Aegorhinus superciliosus_ (Coleopterara: Curculionidae). The larvae of _A.