| interactions among latitude, nematode parasitization, and female sirex nigricornis (hymenoptera: siricidae) fitness. | sirex nigricornis f. (hymenoptera: siricidae) is an innocuous pine-inhabiting woodwasp native to eastern north america, utilizing dead or dying pine trees as hosts. although s. nigricornis f. does not cause economic damage, a closely related species, sirex noctilio, was discovered in new york in 2004 and has continually spread throughout the northeastern united states and southern canada, threatening the multi-billion-dollar pine timber industry of the southeastern united states and raising inte ... | 2016 | 28028099 |