Sirex nigricornis F. (Hymenoptera: Siricidae) is a native woodwasp in eastern North America that inhabits dead and dying pine trees during its univoltine development. Sirex noctilio is native to Eurasia and North Africa and was discovered in the northeastern United States in 2004 after a century of accidental introductions across the Southern Hemisphere. Since then, it has spread to seven state...

Deladenus siricidicola is a principal biological control agent used to suppress populations of the globally invasive pine pest, woodwasp Sirex noctilio. Previous studies have reported low genetic diversity in D. programs Southern Hemisphere and identified two additional, distinct lineages North America Spain. In this study, we tested ability these three interbreed produce viable offspring. We m...