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Adelges tsugae, the hemlock woolly adelgid (/ ə ˈ d ɛ l. dʒ ɪ d / [1]) or HWA, is an insect of the order Hemiptera (true bugs) native to East Asia. It feeds by sucking sap from hemlock and spruce trees ( Tsuga spp.; Picea spp.).
The balsam woolly adelgid (Adelges piceae) is small wingless insect that infests and kills firs.In their native Europe they are a minor parasite on silver fir and Sicilian fir, but they have become a threat especially to balsam fir and Fraser fir after they were introduced to the United States around the beginning of the 20th century.
From 1995 to 1997, experiments in Connecticut and Virginia found that releasing adult Sasajiscymnus tsugae beetles into infested hemlock stands resulted in a 47 to 88 percent reduction in adelgid densities within five months of introduction. [2] The beetle's lifecycle is in parallel to the lifecycle of the hemlock woolly adelgid.
Join conservationists for a hands-on workshop at Cumming Nature Center to identify and survey the tree-killing insect, hemlock woolly adelgid.
Eastern hemlock populations in North America are threatened in much of their range by the spread of the invasive Hemlock woolly adelgid, which infests and eventually kills trees. Declines in population from hemlock wooly adelgid infestation have led to Tsuga canadensis being listed as Near Threatened on the IUCN Red List.
L. nigrinus larva feeding in an A. tsugae ovisac. Laricobius nigrinus is a species of tooth-necked fungus beetle in the family Derodontidae. [1] [2] It is native to western North America, and it is being studied as a biological control agent for the hemlock woolly adelgid. [3]
Laricobius is a genus of beetles in the family Derodontidae, the tooth-necked fungus beetles. [1]It is one of four genera in the family. While the other three feed on fungi, Laricobius species feed on adelgids, tiny insects very similar to aphids. [2]
Arboriculture – Control of the emerald ash borer, hemlock woolly adelgid, [17] and other insects that attack trees (including hemlock, maple, oak, and birch) [9] Home Protection – Control of termites, [3] [16] carpenter ants, cockroaches, and moisture-loving insects; Domestic animals – Control of fleas (applied to the back of the neck) [3]