“…Most of the studies about the responses of predators to dual herbivory are mainly focused on the behavior of predatory mites (De Boer et al, 2008;Zhang et al, 2009;Lima et al, 2017) or predatory bugs (Moayeri et al, 2007), whereas predator performance, and effects of omnivorous arthropods, have received little attention so far. Predatory hoverflies (Diptera: Syrphidae) are important aphid natural enemies, which are often studied in the context of biological control (Brewer and Elliott, 2004;Pineda and Marcos-García, 2008;Almohamad et al, 2009;Amorós-Jiménez et al, 2014, 2015Amiri-Jami et al, 2017), being commercially used as biological control agents in greenhouse crops. Gravid syrphid females, searching for plants on which they lay eggs, are able to detect and avoid potential intraor interspecific competition (Hindayana et al, 2001;Fréchette et al, 2007;Pineda et al, 2007;Amorós-Jiménez et al, 2015).…”