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Home  > Local Tree Care Services  > Tennessee TN  > Knox County TN Tree Service

PURPLE INSECT TRAPS USED TO MONITOR FOR EMERALD ASH BORER

Knoxville, TN





State and federal forestry officials have placed several thousand purple insect traps around Knox County to monitor for the invasive insect Emerald Ash Borer. Forestry officials have been on alert for Emerald Ash Borer since its discovery on I-40 last summer near the Knox County and Loudon County line.

Emerald Ash Borer was identified in 2002 in Wayne County, MI and since that time has killed millions of Ash trees in Michigan and several other states. It is believed the invasive insect was brought to the U.S. in packing crates from China. The Emerald Ash Borer attacks stressed and healthy Ash trees. The larvae kill the tree by tunneling under the bark, disrupting the movement of water and nutrients within the Ash tree.

Knox County and Loudon County have been quarantined to try to prevent the inadvertent movement of Emerald Ash Borer to other counties in Tennessee. Regulated material such as Ash tree nursery stock, Ash logs or lumber, or Ash wood should not be moved out of the quarantine zone.

BLACK WALNUT QUARANTINE EXPANDED

Knoxville, TN





New discoveries of Thousand Cankers Disease have prompted Tennessee forestry officials to expand their original quarantine on Black Walnut trees and Black Walnut wood products. Originally, Knox County was the only county quarantined when a Black Walnut with Thousand Cankers Disease was discovered in the area in August of 2010. Officials have now included Anderson, Blount, Campbell, Claiborne, Grainger, Jefferson, Knox, Loudon, Monroe, Morgan, Roane, Scott, Sevier, and Union counties in the quarantine zone and may add more depending on the results of tree surveys to be done in 2011.

Thousand Cankers Disease is a native disease of the southwest United States. It infects Arizona Walnuts, but doesn’t cause significant damage to the tree. The disease is moved from tree to tree by the Walnut Twig Beetle. The disease moved to Black Walnuts planted in Colorado as landscape trees. The insect that transmits the disease was believed to have been moved across the country by infested Black Walnut material brought to Tennessee from Colorado.

The Black Walnut quarantine is designed to try to prevent the spread of Thousand Cankers Disease from suburban areas into the native forest. Tennessee forestry officials are advising everyone to not transport firewood throughout the state. If a Black Walnut is taken down on your property the wood should remain on your property. This same advice applies to Ash trees, which may be infested with the invasive insect Emerald Ash Borer.

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THOUSAND CANKERS DISEASE THREATENS TENNESSEE BLACK WALNUTS

Knoxville, TN


Thousand Cankers Disease may have started infecting Black Walnuts in the western U.S., but it is in Tennessee now. The question now is can it be contained? Currently there are no fungicide treatments available to cure or prevent Thousand Cankers Disease and it is almost always fatal to a Black Walnut once it is infected. Tree spraying to control the insect vector, the Walnut Twig Beetle, isn’t a promising solution either because the beetle is active during most of the growing season.

The Walnut Twig Beetle is a native insect to the western U.S. and Thousand Cankers Disease may be a native disease as well. The disease doesn’t cause significant harm to Arizona Walnuts, but Black Walnuts are extremely susceptible to the disease. Once Black Walnuts were planted out west the beetle, along with the disease, was able to infect Black Walnuts. The final step to make this a potential crisis for Black Walnuts in their native range was the transportation of infected wood from the western U.S. to the eastern U.S.

Walnut Twig Beetles are very small - about the size of the letter “i” on a Liberty dime. The insect tunnels into the cambium of the tree and carries disease spores with it. The disease causes a canker to form which inhibits the flow of water and nutrients in the tree. The Walnut Twig Beetle may have three generations in one growing season and as many as 30 beetles can develop under a single square inch of tree bark. It takes about three years for enough cankers to form to kill a Black Walnut.

Thousand Cankers Disease is not visible from the outside of a Black Walnut tree. The first sign that a Black Walnut might be infected with Thousands Canker Disease is yellowing leaves and a thin canopy. Dead leaves often stay on the tree instead of falling off. As the infection progresses individual branches will begin to die starting at the top of the tree.

To slow, or prevent, the spread of Thousand Cankers Disease avoid moving tree logs or firewood. Buy campfire wood locally and burn it all or leave it at your campsite. Wood from trees that have been cut down should be left on site.
 

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