View source for Journal of Pest Science (2021) 94, 1161-1169

{{Publication
|Publication authors=Guillaume Martel and [[René Sforza|René F.H. Sforza]]
|Author Page=René Sforza
|Publication date=2021
|dc:title=Catch me if you can: novel foraging behavior of an egg parasitoid, ''Gryon gonikopalense'', against the stinkbug pest, ''[[Bagrada hilaris]]''
|Publication journal=Journal of Pest Science
|prism:volume=94 (4)
|prism:startingPage=1161
|Last page=1169
|Publication abstract=Host detection and parasitism by egg parasitoids involve host chemical recognition, spatial overlapping, and the ability to overcome physical barriers. Within the context of importation biological control, we examined the potential of ''Gryon gonikopalense'' (Hym.: Scelionidae), against the stinkbug pest, ''Bagrada hilaris'' (Hem.: Pentatomidae). Bagrada is invasive in the Americas where it negatively impacts cruciferous cropping systems. Within Pentatomidae, bagrada possesses a unique behavioral trait in that its eggs are oviposited buried. Our study aimed to evaluate the capacity of ''G. gonikopalense'' to respond to bagrada ovipositional behavior. We showed that ''G. gonikopalense'' exhibits a well-adapted foraging behavior observed by tracking and successfully parasitizing 2 mm-deep buried bagrada eggs, which was further supported by video recordings. Four conditions of egg detectability by parasitoids (free eggs, naturally buried eggs, and manually buried with disturbed or clean sand) and foraging durations were tested in Petri dishes. The parasitism rate of 100% was obtained after 72 hours for both free and naturally buried eggs; a rate of 71% was obtained after 2 h with free eggs. There was no significant difference concerning the parasitoid success rate (< 40%) with manually buried eggs. Our data suggested that host egg detection was based on chemical cues since parasitism success was reduced by up to 20% when eggs were manually buried under a clean substrate or a substrate previously used for oviposition but disturbed. ''Gryon gonikopalense'' can overcome both the egg detection and physical barrier constituted by the sand to parasitize the pest despite a reduced number of progeny produced.

Please note that [[Journal of Hymenoptera Research (2021) 87, 323-480|Talamas et al., 2021]] described a new species, ''Gryon aetherium'' for the species provisionally assigned here to ''Gryon gonikopalense''.
|AbstractCC=Yes
|AuthorsAbstract=No
|DOI=10.1007/s10340-020-01325-4
|Dc:language=English
|Research topic=biocontrol - natural enemies
|Benf research=general biology - morphology - evolution
|Research2B=evaluation - screening - selection
|Is book=No
}}
{{Pest record
|Pest=Bagrada hilaris
|Crop=Cabbage (Brassica oleracea)
|Quarantined=No
}}
{{Beneficial record
|Beneficial=Gryon aetherium (parasitoid)
|Pest=Bagrada hilaris
|Country=Pakistan
}}