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Keyword: Pinus longaeva

Preliminary overview of the first extensive rust resistance screening tests of Pinus flexilis and Pinus aristata

Publications Posted on: July 05, 2011
Limber pine ( Pinus flexilis James) and Rocky Mountain bristlecone pine (P. aristata Engelm.; hereafter referred to as bristlecone pine) are the dominant pines that occupy high elevation habitats of the southern Rockies.

Past and current investigations of the genetic resistance to cronartium ribicola in high-elevation five-needle pines

Publications Posted on: July 05, 2011
All nine species of white pines native to the U.S. or Canada are susceptible to the introduced pathogen Cronartium ribicola. Of the six high elevation white pine species, the severe infection and mortality levels of Pinus albicaulis have been the most documented, but blister rust also impacts P. aristata, P. balfouriana, P. flexilis and P. strobiformis; only P. longaeva has not been documented to be infected in its natural range.

Histological observations on needle colonization by Cronartium ribicola in susceptible and resistant seedlings of whitebark pine and limber pine

Publications Posted on: July 05, 2011
Resistance to white pine blister rust based on a hypersensitive response (HR) that is conferred by a dominant gene has been identified as functioning in needles of blister rust-resistant families of sugar pine, western white pine and southwestern white pine. The typical HR response displays a characteristic local necrosis at the site of infection in the needles during the early stages of needle colonization by Cronartium ribicola.

Can microscale meteorological conditions predict the impact of white pine blister rust in Colorado and Wyoming?

Publications Posted on: July 01, 2011
White pine blister rust occurs when there are compatible interactions between susceptible hosts (white pines and Ribes spp.), inoculum (Cronartium ribicola spores), and local weather conditions during infection. The five spore stages of the white pine blister rust (WPBR) fungus have specific temperature and moisture conditions necessary for production, germination, and dissemination of spores.

Re-measurement of whitebark pine infection and mortality in the Canadian Rockies

Publications Posted on: July 01, 2011
Whitebark pine (Pinus albicaulis) populations are under threat across the species' range from white pine blister rust (Cronartium ribicola), mountain pine beetle (Dendroctonus ponderosae), fire exclusion and climate change (Tomback and Achuff 2010).

Annual observations of conspicuous canker activity on whitebark pine (2003 to 2007)

Publications Posted on: July 01, 2011
Whitebark pine's (Pinus albicaulis) notable ecological values, combined with its precarious state, underscore the need for monitoring its health and dynamics. Populations of whitebark pine are in decline throughout most of its range. White pine blister rust, caused by the fungus Cronartium ribicola, has denuded stands since introduction during the early 1900s (Tomback and Achuff 2010).

Valuing the forest for the trees: Willingness to pay for white pine blister rust management

Publications Posted on: July 01, 2011
The nearly two million acres of high elevation forests in the Western United States are not an important source of timber or any other market products. However, that does not mean that the forests are not highly valuable. Visitors and nonvisitors alike value the unique five-needle pine trees found in these high elevation ecosystems.

Limber pine forests on the leading edge of white pine blister rust distribution in Northern Colorado

Publications Posted on: July 01, 2011
The combined threats of the current mountain pine beetle (Dendroctonus ponderosae, MPB) epidemic with the imminent invasion of white pine blister rust (caused by the non-native fungus Cronartium ribicola, WPBR) in limber pine (Pinus flexilis) forests in northern Colorado threatens the limber pine's regeneration cycle and ecosystem function. Over one million hectares of Colorado forests have been infested by MPB between 1996 and 2008 (U.S.

Monitoring white pine blister rust infection and mortality in whitebark pine in the Greater Yellowstone ecosystem

Publications Posted on: July 01, 2011
There is a critical need for information on the status and trend of whitebark pine (Pinus albicaulis) in the Greater Yellowstone Ecosystem (GYE). Concerns over the combined effects of white pine blister rust (WPBR, Cronartium ribicola), mountain pine beetle (MPB, Dendroctonus ponderosae), and climate change prompted an interagency working group to design and implement a long-term monitoring program in the GYE.

A natural history of Cronartium ribicola

Publications Posted on: July 01, 2011
Cronartium ribicola is a fungal pathogen that causes a blister rust disease of white pines, Ribes, and other hosts in the genera Castilleja and Pedicularis. Although blister rust can damage white pine trees and stands, the severity and significance of these impacts vary with time, place, and management. We use a natural history approach to describe the history, biology, and management of C. ribicola.

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