Thousand Cankers Disease Quarantine


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July 24, 2012

CONTACT
Irene Haske
DPWES - Stormwater Management
703-324-5821, TTY 711
703-324-5500

Thousand Cankers Disease Quarantine Imposed for Fairfax County

The Virginia Department of Agriculture and Consumer Services expanded the Thousand Cankers Disease (TCD) quarantine to include Fairfax County where TCD was detected. The quarantine is necessary to prevent the spread of the disease which attacks walnut trees.

Regulated items that may not be moved out of Fairfax County include all walnut plants and plant parts of walnut, including logs, stumps, firewood, roots, branches, mulch and chips.

TCD is a fungus (Geosmithia morbida) spread by the walnut twig beetle (Pityophthorus juglandis) that causes small cankers or open wounds on the trunks and branches of walnut trees. The beetle introduces the fungus while it tunnels beneath the bark. As more beetles attack the tree, the number of cankers increases until they coalesce to girdle twigs and branches, restricting movement of nutrients and eventually killing the tree. Neither the beetle nor the fungus is native to the eastern United States. Thinning or dead branches initially occur at the top of the tree which then dies from the top down. Trees may be infected for many years before showing symptoms. There is no preventive or curative treatment for the disease. Once established, TCD has the potential to spread to areas that are not infested, either through natural means or through the human movement of infested walnut items.

More information about Thousand Cankers Diseases is available from the Virginia Department of Agriculture and Consumer Services.

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