globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2014.09.021
Scopus记录号: 2-s2.0-84907960601
论文题名:
Establishment, hybridization and impact of laricobius predators on insecticide-treated hemlocks: Exploring integrated management of the hemlock woolly adelgid
作者: Mayfield A.E.; Reynolds B.C.; Coots C.I.; Havill N.P.; Brownie C.; Tait A.R.; Hanula J.L.; Joseph S.V.; Galloway A.B.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2015
卷: 335
起始页码: 1
结束页码: 10
语种: 英语
英文关键词: Adelges tsugae ; Biological control ; Imidacloprid ; Laricobius nigrinus ; Olefin-imidacloprid ; Tsuga canadensis
Scopus关键词: Adelges tsugae ; Biological controls ; Imidacloprids ; Laricobius nigrinus ; Olefin-imidacloprid ; Tsuga canadensis ; biological control ; chemical control ; coniferous tree ; hybridization ; imidacloprid ; insect ; integrated pest management ; larva ; native species ; predator ; Georgia ; United States ; Adelges tsugae ; Adelgidae ; Laricobius ; Laricobius nigrinus ; Tsuga canadensis
英文摘要: An integrated management approach is needed to maintain eastern hemlock (Tsuga canadensis (L.) Carrière) in eastern North America and to minimize tree damage and mortality caused by the invasive hemlock woolly adelgid (Adelges tsugae Annand). This study examined the hypothesis that chemical control with low rates of insecticide and biological control can be combined in the same stand to impact adelgid populations, prolong crown health, and allow predator proliferation. Sixty T. canadensis trees in northern Georgia were individually treated via soil injection with 0%, 10%, or 25% of the label rate of imidacloprid insecticide, and the biological control predator Laricobius nigrinus Fender was released in the stand, two and four years later. By year seven, hemlocks treated with the 25% imidacloprid rate lost their insecticide protection, had significantly better crown health and higher adelgid densities than untreated trees, and supported as many Laricobius predator larvae as untreated trees. In year seven, no residues of imidacloprid were detected in Laricobius larvae feeding on previously-treated hemlocks. Most (77%) of the predators collected on study trees were identified as L. nigrinus, 12% were the native congener Laricobius rubidus LeConte, and 11% were hybrids between the introduced and native species. The hybridization rate remained stable over time. The density of undisturbed A. tsugae ovisacs was twice as high on branches protected from predators as compared with branches exposed to predators. Results suggest that chemical and biological control of A. tsugae can be successfully integrated to help prolong hemlock health, although additional predators may be necessary to protect hemlock trees in the southern Appalachians. © 2014.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65644
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作者单位: USDA Forest Service, Southern Research Station, 200 W.T. Weaver Boulevard, Asheville, NC, United States; University of North Carolina Asheville, One University Heights, Asheville, NC, United States; The University of Tennessee, Entomology and Plant Pathology Department, 2505 E.J. Chapman Drive, Knoxville, TN, United States; USDA Forest Service, Northern Research Station, 51 Mill Pond Rd., Hamden, CT, United States; 3309 Horton Street, Raleigh, NC, United States; USDA Forest Service, Southern Research Station 320 Green Street, Athens, GA, United States; University of Georgia, Department of Entomology, 1109 Experiment St., Griffin, GA, United States; University of California, 1432 Abbott Street, Salinas, CA, United States; Roane State Community College, Math and Sciences Department, Oak Ridge Branch Campus, 701 Briarcliff Ave., Oak Ridge, TN, United States

Recommended Citation:
Mayfield A.E.,Reynolds B.C.,Coots C.I.,et al. Establishment, hybridization and impact of laricobius predators on insecticide-treated hemlocks: Exploring integrated management of the hemlock woolly adelgid[J]. Forest Ecology and Management,2015-01-01,335
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