Skip to Main Content
Association of an insect-fungal complex with red pine decline in WisconsinAuthor(s): Kier D. Klepzig; K.F. Raffa; E.B. Smalley
Source: Forest Science, Vol. 37, No. 4, pp. 1119-1139
Publication Series: Miscellaneous Publication
PDF: Download Publication (1.2 MB)
DescriptionRed pine decline, characterized by an expanding circular area of dead and declining trees, is becoming increasingly prevalent in Lake States plantations. A 3-year study was conducted to determine whether any insects, fungi, andor soil parameters were assoctated with this syndrome. The root collar weevil-Hylobius radicis, the pales weevil-Hylobius pales, the pitch-eating weevil-Pachylobius picivorus, the red turpentine beetle-Dendroctunus valens and Hylastes porculus were significantly more abundant in declining stands than in healthy Pinus resinosa stands. These root- and lower stem-infesting insects consistently carried Leptographium terebrantis and Leptographium procerum.Higher soil organic matter, pH and K levels were also associated with areas of mortality. Intensive root sampling revealed high levels of root mortality, staining , infestation with Leptographium species and extensively grafted root systems in decking red pine stands. This advancing belowgound mortality precedes the aboveground symptoms of reduced radial growth, thin crown structure, and infestation by the pine engraver, Ips pini, and its fungal associate Ophiostoma ips. Colonization by the latter two species is ahvays associated with and/or responsible for ultimate tree death. A sequence of interactions among this complex of organisms and abiotic factors is proposed as the cause of red pine decline.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationKlepzig, Kier D.; Raffa, K.F.; Smalley, E.B. 1991. Association of an insect-fungal complex with red pine decline in Wisconsin. Forest Science, Vol. 37, No. 4, pp. 1119-1139
KeywordsBark beetles, root weeds, root graft, root disease, forest decline
- Association of wildfire with tree health and numbers of pine bark beetles, reproduction weevils and their associates in Florida
- Assessment of loblolly pine decline and site conditions on Fort Benning Military Reservation, GA
- Effects of diterpene acids on components of a conifer bark beetle–fungal interaction: tolerance by Ips pini and sensitivity by its associate Ophiostoma ips
XML: View XML