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Predicting Leucotaraxis Spp Adult Emergence In The Pacific Northwest With Implications For Biological Control Of Hemlock Woolly Adelgid In The Eastern United States
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Book Synopsis Predicting Leucotaraxis Spp. Adult Emergence in the Pacific Northwest With Implications for Biological Control of Hemlock Woolly Adelgid in the Eastern United States by : Liam Farley
Download or read book Predicting Leucotaraxis Spp. Adult Emergence in the Pacific Northwest With Implications for Biological Control of Hemlock Woolly Adelgid in the Eastern United States written by Liam Farley and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hemlock woolly adelgid (Adelges tsugae) is a non-native, invasive pest of eastern hemlock (Tsugae canadensis) and Carolina hemlock (Tsugae caroliniana), both of which are considered important foundation species in forest ecosystems. Adelges tsugae has caused widespread decline and mortality of hemlock trees in eastern North America. Native hemlocks are particularly vulnerable because of the absence of co-evolved plant defenses and lack of natural enemies of A. tsugae. Managing A. tsugae through development of a biological control program has great potential at the regional level. Two species of silver fly from the Pacific northwest (PNW) Leucotaraxis argenticollis and Leucotaraxis piniperda are being studied as potential biological control agents for this purpose, with individuals from wild populations being collected and examined for biological control effectiveness. However, a limitation has been the lack of efficient collection methods for Leucotaraxis spp. sufficient to yield adequate numbers for research and operational releases. In this study, Le. argenticollis and Le. piniperda were assessed for i) the quantitative impacts they have on A. tsugae ovisacs, and ii) the phenology of adult Leucotaraxis spp. in the PNW. Data on observed predation impacts were collected at two locations in North Carolina. Hemlock tree branches infested with A. tsugae were caged with mesh bags and Leucotaraxis spp. were released inside. A. tsugae ovisacs were counted before and after collections. The phenology of adult Leucotaraxis spp. in the PNW was characterized using a degree day model from five years of collection data. Our results show a Leucotaraxis spp. emergence window of 566-730 degree days which aligns with 126-145 Julian days in the study region. Significant negative effects on A. tsugae ovisac counts between controls and Leucotaraxis spp. treatments were found atfound 8 weeks after initial release. These results will help researchers and managers with more effective timing of collections in the PNW and controlled releases of Leucotaraxis spp. within the range of eastern hemlock species.
Book Synopsis Eastern Hemlock Forests by : Jeffrey S. Ward
Download or read book Eastern Hemlock Forests written by Jeffrey S. Ward and published by . This book was released on 2004 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hemlock written by Anthony D'Amato and published by Yale University Press. This book was released on 2014-04-29 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: An appreciation of the beautiful, iconic, and endangered Eastern Hemlock and what it means to nature and society The Eastern Hemlock, massive and majestic, has played a unique role in structuring northeastern forest environments, from Nova Scotia to Wisconsin and through the Appalachian Mountains to North Carolina, Tennessee, and Alabama. A “foundation species” influencing all the species in the ecosystem surrounding it, this iconic North American tree has long inspired poets and artists as well as naturalists and scientists. Five thousand years ago, the hemlock collapsed as a result of abrupt global climate change. Now this iconic tree faces extinction once again because of an invasive insect, the hemlock woolly adelgid. Drawing from a century of studies at Harvard University’s Harvard Forest, one of the most well-regarded long-term ecological research programs in North America, the authors explore what hemlock’s modern decline can tell us about the challenges facing nature and society in an era of habitat changes and fragmentation, as well as global change.
Download or read book Federal Recycling Program written by and published by . This book was released on 1992 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
