Host and oak species impact clutch and adult size of Oobius rudnevi, the only known egg parasitoid of Cerambyx beetles

Oobius rudnevi (Nowicki) (Hymenoptera: Encyrtidae) is the only known egg parasitoid of the longhorn beetles Cerambyx cerdo L. and Cerambyx welensii (Küster) (Coleoptera: Cerambycidae). This micro-wasp is a gregarious and predominantly univoltine species, active during the summer when host eggs are present in the wild. Both longhorn beetles occur sympatrically in holm oak, cork oak, and Pyrenean oak forests in SW Iberia, where they can cause significant damage to trees by boring large galleries into the wood. Despite the potential of O. rudnevi as a native biocontrol agent, our understanding of its life history and parasitic capacity remains limited. This study aimed to investigate whether host egg species and oak species interact to influence O. rudnevi‘s reproductive allocation, adult size, and sex ratio. To achieve this, we compared sentinel eggs of C. cerdo and C. welensii, which were field-exposed in holm oak, cork oak, and Pyrenean oak forests over a two-year study (2017–..., , # Host and oak species impact clutch and adult size of *Oobius rudnevi*, the only known egg parasitoid of Cerambyx beetles

Dataset DOI: [10.5061/dryad.8sf7m0d1r](10.5061/dryad.8sf7m0d1r)

## Description of the data and file structure

The region of Extremadura (41,634 km2) contains more than 1.2 million hectares of oak forests (Spain).

144 eggs

### Files and variables

#### File: Data_oobius_AFE.xls

##### Variables

* egg_ref: egg reference for each egg (n = 144)
* tube_ref: tube reference for each tube (n = 144)
* year: year
* spp: longhorn beetle species (Cc: Cerambyx cerdo; Cw: Cerambyx welensii)
* oak_tree: oak tree species (Co: cork oak; Ho: holm oak; Po: Pyrenean oak)
* total_fem: total number of females (emerged and un-emerged)
* total_mal: total number of males (emerged and un-emerged)
* total_adult: total number of adults (total_fem + total_mal)
* adult_emerg: number of emerged adults
* percent_emerg: adult_emerg / tot_adult
* larvae: number of dead mature larvae that do no...,