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Dynamics of twolined chestnut borer Agrilus bilineatus as influenced by defoliation and selection thinning

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1 The twolined chestnut borer, Agrilus bilineatus (Coleoptera: Buprestidae), is a major mortality agent of stressed oak trees. However, patterns of abundance and population change are not well understood.

2 We studied the spatial and temporal variation in abundance of twolined chestnut borer adults during a gypsy moth, Lymantria dispar (Lepidoptera: Lymnatriidae), outbreak and examined the influence of both defoliation and thinning on twolined chestnut borer abundance.

3 In stands that were defoliated by gypsy moth, extensive defoliation occurred in one year, and major overstory tree mortality followed in the next. Most mortality occurred in the year preceding the peak year of twolined chestnut borer abundance and abundance of twolined chestnut borer was positively associated with defoliation and mortality in the previous year.

4 Twolined chestnut borers were more frequently associated with poor or fair crown condition trees than trees with good crown condition and were more abundant on members of the red oak group than the white oak group.

Keywords: Agrilus bilineatus; Buprestidae; Lymantria dispar; defoliation; gypsy moth; oak forest; silviculture; twolined chestnut borer

Document Type: Research Article

Affiliations: 1: Department of Forestry, University of Missouri, 203 Natural Resources Bldg., Columbia, MO 65211, U.S.A., 2: USDA Forest Service, Northeastern Research Station, Morgantown, WV 26505, U.S.A. and 3: USDA Forest Service, Northeastern Research Station, Bington, VT 05402, U.S.A.

Publication date: November 1, 2000

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