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Title: The introduction of Laricobius nigrinus as a biological control agent for the hemlock woolly adelgid: Is there a threat to the native congener, L. rubidus?

Author: Havill, Nathan P.; Salom, Scott; Davis, Gina; Fischer, Melissa; Mausel, David; Onken, Bradley.;

Date: 2011

Source: In: Onken, B.; Reardon, R. eds. Implementation and status of biological control of the hemlock woolly adelgid. FHTET-2011-04. Morgantown, WV: U.S. Department of Agriculture, Forest Service Forest Health Technology Enterprise Team: 212-221. Chapter 21.

Publication Series: Book Chapter

Description: Laricobius Rosenhauer is one of four genera in the family Derondontidae (Coleoptera) that occupies the temperate regions of the Northern Hemisphere (Lawrence 1989). Members of this genus are only known to prey on adelgids (Hemiptera: Adelgidae) (Lawrence and Hlavac 1979, Lawrence 1989). There are three species native to North America: L. nigrinus and L. laticollis are native to western North America, and L. rubidus is native to eastern North America. Laricobius nigrinus is being used in the eastern United States as a biological control of the hemlock woolly adelgid. Previously, L. erichsonii was introduced to both coasts of North America from Europe for control of the balsam woolly adelgid (summarized in Montgomery et al. 2011). This species was reported to have established, but its most recent recorded recovery was in 1978 (Schooley et al. 1984). A molecular study of the relationships among the four Laricobius species reported in North America, plus L. kangdingensis and L. osakensis from Asia, showed that, surprisingly, the two species from western North America were not the most closely related (Montgomery et al. 2011). Instead, it was found that L. nigrinus is very closely related to the eastern species, L. rubidus.

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Havill, Nathan P.; Salom, Scott; Davis, Gina; Fischer, Melissa; Mausel, David; Onken, Bradley. 2011. The introduction of Laricobius nigrinus as a biological control agent for the hemlock woolly adelgid: Is there a threat to the native congener, L rubidus?. In: Onken, B.; Reardon, R. eds. Implementation and status of biological control of the hemlock woolly adelgid. FHTET-2011-04. Morgantown, WV: U.S. Department of Agriculture, Forest Service Forest Health Technology Enterprise Team: 212-221. Chapter 21.

 


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