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Seasonal Assessment of Supercooling Points for Two Introduced and One Native Laricobius spp. (Coleoptera: Derodontidae), Predators of Adelgidae

Virginia Tech, Blacksburg, VA 24061, USA
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Insects 2019, 10(12), 426; https://doi.org/10.3390/insects10120426
Received: 22 October 2019 / Revised: 14 November 2019 / Accepted: 22 November 2019 / Published: 26 November 2019
The hemlock woolly adelgid, Adelges tsugae Annand, is an invasive insect that threatens hemlock species in eastern North America. Several species from the genus Laricobius are predators of A. tsugae in its native areas of Asia and the western United States. Two Laricobius species have been released as biological control agents: Laricobius nigrinus Fender, and Laricobius osakensis Montgomery and Shiyake. Laricobius rubidus LeConte is an adelgid predator native to the Eastern United States, where it can feed and complete development on A. tsugae opportunistically. Laboratory assays were conducted to assess the cold hardiness of these three Laricobius species, including two distinct populations of L. osakensis, by measuring the supercooling points of each species from November 2016 through March 2017. This information may be useful for choosing the best-suited biological control agent for a particular region to control A. tsugae. There was a significant difference between the overall mean supercooling point of L. rubidus compared to the other Laricobius spp. There were also significant differences of supercooling points between L. rubidus and both strains of L. osakensis in January, and significant differences between L. rubidus and all other strains in February. L. rubidus appear better adapted to cold extremes in the eastern U.S. than imported Laricobius spp. View Full-Text
Keywords: supercooling point; cold tolerance; Laricobius osakensis; Laricobius nigrinus; Laricobius rubidus; Adelges tsugae; hemlock woolly adelgid supercooling point; cold tolerance; Laricobius osakensis; Laricobius nigrinus; Laricobius rubidus; Adelges tsugae; hemlock woolly adelgid
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Toland, A.A.; Wantuch, H.A.; Mullins, D.E.; Kuhar, T.P.; Salom, S.M. Seasonal Assessment of Supercooling Points for Two Introduced and One Native Laricobius spp. (Coleoptera: Derodontidae), Predators of Adelgidae. Insects 2019, 10, 426.

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