Amylostereum-areolatum
Guides
Eriotremex formosanus
Asian Horntail
Eriotremex formosanus is an Asian horntail wasp (family Siricidae) native to Asia that has been introduced and established in the southeastern United States. Unlike most siricid wasps, which specialize on conifers, this species exhibits unusually broad host associations, utilizing both coniferous and hardwood tree species. Females possess a long ovipositor for drilling into wood and deposit eggs along with fungal symbionts (Amylostereum areolatum) that larvae feed upon during development. The species targets stressed, dying, or recently dead trees rather than healthy timber.