The dataset includes the data analysed in the manuscript "Assessment of Azorean native strains of Heterorhabditis bacteriophora for the biological control of Popillia japonica", consisting in two assays. The first one explores the susceptibility of larvae to 5 EPNs under laboratory conditions and it was evaluated by time of death (measured as days). The second was a semi-field experiment in which mortality was observed 15 days after treatment, data provided includes the number of alive, dead by EPNs or dead by other causes, and the proportion by the total of recovered larvae.

METHODOLOGICAL INFORMATION Description of methods used for collection-generation of data: For the susceptibility assay: third-instar larvae were individualized in 6-well multiplates and we tested seperately 5 EPNs. Mortality was checked everyday for 10 days. For the semi-field assay: PVC tubes were buried into an infested field and 5 larvae were added while we tested seperately 5 EPNs. After 15 days, tubes were unburied and checked for the larvae status.