Thousand Cankers
Disease (TCD) Survey Guidelines Now Available
(May 2012)
USDA. Animal and Plant
Health Inspection Service.
In cooperation
with the U.S. Forest Service,
APHIS Plant Protection and Quarantine has
updated the Thousand
Cankers Disease (TCD) Survey Guidelines for
2012 (Apr 2012; PDF | 4.5 MB). The
main change to the guidelines from last year
is the addition of instructions on how to use
the lure that has been developed for walnut
twig beetle. TCD results from the combined
activity of Geosmithia
morbida fungus and the
walnut twig beetle (WTB, Pityophthorus
juglandis).
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Native To: Disease was
first detected in the Western U.S..; the disease
vector, the walnut twig beetle, is native to the
southwestern U.S. and Mexico
Date of U.S. Introduction:
First observed in the 1990s, but not recognized until 2008
Images: Invasive.org and Google
Videos: Tree
Diseases -- includes Thousands Cankers (or
click Play button below)
Knoxville News Sentinel - The dangers of Thousand Cankers Disease (or click Play button below)
Means of Introduction: Unknown,
but the disease can be transmitted by movement of wood infested with
the walnut twig beetle
Impact: Fungal disease of
walnut trees (Juglans spp.), particularly the black walnut
(Juglans nigra), that is usually lethal within a few years;
disease is transmitted by the walnut twig beetle, Pityophthorus
juglandis
Current U.S. Distribution:
Widespread throughout the Western U.S.; first
detected in the Eastern U.S. in Aug 2010
Management Plans: Microbes
Selected Internet Resources:
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