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Forestry & Society
“A healthy forest can renew itself vigorously across the landscape, recover from a wide range of disturbances, and retain its ecological resilience while meeting current and future needs of people for values, uses, products, and services.”
USDA Forest Service, 1997
Pest Species Migration
American chestnut (50% mortality by 1930)
American Elm (77 million killed in 20th century)
Forest @ risk
Late 1800’s throughout range of eastern white pine and
early 1900’s in 6 western. Killing pines in western high elevation ecosystems, eliminating wildlife forage; affecting soil stability, snowmelt.
CurrentForest PestsWhite Pine Blister Rust Spread
Millions of Acres
Asian gypsy moths such as this male, left, and female attack more than 500 plant species.
Could cause elimination of ash as a street, shade, and forest tree nationwide at an estimated cost of $282 billion.
Imported from Asia
Infested Canada, MI (1999) & OH & MD
Killed 6kk trees in MI alone (2002-2004)
D.G. McCullough, Tree Farmer (Mar/Apr 2006)
Photos by David Cappaert
Joseph O'BrienForest PestsSudden Oak Death = Phytophthoraramorum
Native to Western Europe
Discovered on West Coast
(Adelges piceae) 1908 Attacks true fir species. Caused dramatic declines in Fraser fir in
Great Smoky Mountains National Park, resulting in understory and
Subalpine fir 1965
(Adelges tsugae) 1920’s from Asia. Currently in more than 4 states. Contributing to decline of eastern and Carolina hemlocks. Alters bird communities where it kills eastern hemlock.
Photos by M. Smith
Nebraska Forestry Service
Yellow starthistle competes with mariposa lily
PNW Sci. Update 9:2:Mar’05
Cover (%) after 3 yrs
2nd Growth Douglas-fir
VDT = Variable density thinning
Ministry of Forests
1 m3 = 1 telephone pole
Will climate change spell the end of forests in North America?
A warmer climate allows the beetle to migrate north and potentially east and then south!!!
does not work! It’s
Millions of Acres
is native to Rocky Mountains.
Feeds on Douglas-fir and