Mean fecundity of female wasps from different strains of L. distinguendus on different hosts: (a) drugstore beetles as hosts, (b) granary weevils as hosts. RAVdb, STUdb, BIRdb, PFOgw, SLOgw, SATgw: different strains of L. distinguendus. Numbers in brackets refer to the number of replicates. Different letters indicate a significant difference at the 0.05 level using pairwise Mann–Whitney U-tests followed by sequential Bonferroni correction for multiple comparisons. (Online version in colour.)