Laboratory Rearing of Laricobius nigrinus (Coleoptera: Derodontidae): A Predator of the Hemlock Woolly Adelgid (Hemiptera: Adelgidae)

Table 3

The number of Laricobius nigrinus in each life stage at the Virginia Tech Insectary from 2005 to 2010.

Year	Founding colony (reproductive adults)	Mature larvae	Adult : larvae	Emerging adults (after aestivation)
2005	713^a	19,593	1 : 27	3,430
2006	1,067^a	14,492	1 : 14	2,019
2007	1,231^b	40,978	1 : 33	15,294
2008	1,200^a	46,028	1 : 38	20,601
2009	1,030^a + 200^c	32,382	1 : 26	13,283
2010	870^a + 200^c	38,690	1 : 36	27,504

^aWild-caught adults from Washington, USA.
^b Wild-caught adults from Washington, USA and Kentland Farm, Virginia, USA.
^cAdult F₁ generation reared in the insectary at Virginia Tech.