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Walnut Trees Under Quarantine in Jefferson County

News release from state Department of Agriculture:
NASHVILLE – The Tennessee Department of Agriculture has announced the discovery of a walnut tree killing disease, Thousand Cankers Disease (TCD), in Jefferson County. The county is now under quarantine. Hamblen County is now considered a buffer regulated county because it is adjacent to a quarantined county. Rhea County is also being placed in the buffer regulated category because Walnut Twig Beetles have been caught in the county but no TCD fungus has been found.
“We will continue to survey our forests and work to help slow the spread of the disease.” said TDA Plant Certification Administrator Gray Haun. “We are working with stakeholders to help educate citizens on the symptoms of TCD and how they can help.”
TCD is a progressive disease that may kill a tree within two to three years after initial symptoms are detected. The disease-causing fungus, Geosmithia morbida, is transmitted by the Walnut Twig Beetle, Pityophthorus juglandis. Branches and trunk tissue are killed by multiple infections of the fungus as the beetles carry the fungus from one area to the next.
TDA plant inspectors and foresters will continue to conduct a thorough survey of trees in these areas to assess the extent of the infestation and to see if more areas need to be quarantined. Counties already under quarantine for TCD include Anderson, Blount, Knox, Loudon, Sevier and Union. Adjacent counties to the quarantined areas are also restricted for movement of walnut products and hardwood firewood.

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