Yikes: Ash Tree Pest

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Jarred525

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EMERALD ASH BORER DISCOVERED IN EAST TENNESSEE
- Plans underway to survey and restrict movement of ash material in Knox, Loudon counties -

Nashville, Tenn. � The Tennessee Department of Agriculture today announced the discovery of emerald ash borer (EAB), the first detection of the destructive tree pest in the state. The discovery was made last week at a truck stop in Knox County near the Loudon County line.

�We knew EAB could potentially reach Tennessee, and we�re prepared to help slow the spread of the infestation and protect our forest resources.� said state Agriculture Commissioner Ken Givens. �We will be working closely with federal officials and other stakeholders to determine the extent of the infestation and to take steps to limit its spread.�

After receiving a report of a suspected find, state and federal officials collected specimens from infested logs for submission to the U.S. Department of Agriculture for positive identification. USDA confirmed the find late last week.

EAB attacks only ash trees. It is believed to have been introduced into the Detroit, Mich. area 15 to 20 years ago on wood packing material from Asia. Since then, the destructive insect has been found also in Illinois, Indiana, Iowa, Kentucky, Maryland, Minnesota, Missouri, New York, Ohio, Pennsylvania, Virginia, West Virginia and Wisconsin.

In response to the find, TDA plans to issue a quarantine in Knox and Loudon counties prohibiting the movement of firewood, ash nursery stock, ash timber and other material that can spread EAB. TDA plant inspectors and foresters will conduct a thorough survey of trees in the areas to assess the extent of the infestation. The USDA Animal and Plant Health Inspection Service is working closely with TDA in response and will likely issue a federal quarantine in the coming days in support of national efforts to control the spread of EAB.

� MORE �

EMERALD ASH BORER DISCOVERED IN EAST TENNESSEE 2 � 2 � 2 � 2 � 2

Typically, the Emerald Ash Borer beetles can kill an ash tree within three years of the initial infestation. Adults are dark green, one-half inch in length and one-eighth inch wide, and fly only from April until September, depending on the climate of the area. In Tennessee, most EAB adults would fly in May and June. Larvae spend the rest of the year beneath the bark of ash trees. When they emerge as adults, they leave D-shaped holes in the bark about one-eighth inch wide.

The Tennessee Department of Agriculture Division of Forestry estimates that 10 million urban ash trees in Tennessee are potentially at risk from EAB. The risk represents an estimated value loss of $2 billion. There are an estimated 261 million ash trees on Tennessee public and private timberland potentially valued as high as $9 billion.

TDA officials urge area residents and visitors to help prevent the spread of EAB:

� Don�t transport firewood, even within Tennessee. Don�t bring firewood along for camping trips. Buy the wood you need from a local source. Don�t bring wood home with you.

� Don�t buy or move firewood from outside the state. If someone comes to your door selling firewood, ask them about the source, and don�t buy wood from outside the state.

� Watch for signs of infestation in your ash trees. If you suspect your ash tree could be infested with EAB, visit www.TN.gov/agriculture/eab for an online symptoms checklist and report form or call TDA�s Regulatory Services Division at 1-800-628-2631.

For more information about other programs and services of the Tennessee Department of Agriculture visit www.tn.gov/agriculture .
 
East TN forests have had taken two hits recently. In other news...

The Tennessee Department of Agriculture has confirmed the presence of Thousand Cankers Disease (TCD) in Knoxville. This is the first detection of this disease east of Colorado. Both the twig beetle (Pityophthorus juglandis) and the associated canker fungus (Geosmithia sp. nov., proposed species name morbida) have been verified.

http://news.tennesseeanytime.org/node/5684

It has been a tough stretch for the Volunteer State as they also detected their first infestation of emerald ash borer earlier in the week (Knox County).

The TCD infestation is located in the urban part of Knoxville. As this is a recent find, the extent of spread has not been completely delimited. But, based on the size of the area involved, it suggests that this disease has been present for several years.

Previously this problem had only been found in the western states, where eastern black walnut, Juglans nigra is planted, but not native. Now that it is established in the center of the native distribution of Juglans nigra there are no geographic/ecological barriers to prevent its ultimate spread through the East. While the potential for great harm exists, the behavior of the beetle and fungus under eastern conditions is not yet known.

This discovery suggests that there may well be other infestations in the Midwest and East that have gone unnoticed. This is a very difficult disease to detect in early stages. Apparently in Tennessee, as in Colorado, what attracted attention were trees that showed symptoms of apparent drought stress. Drought stress may well be present at many times and it could easily mimic or mask symptoms of TCD. So I encourage everyone to get out and check black walnuts more carefully.

There are many web sites with information on TCD and the Forest Service has a one page pest alert which was distributed to the states earlier.

http://na.fs.fed.us/pubs/palerts/canker ... ow_res.pdf

We still have much to learn about TCD and its impact. The disease is relatively slow to develop, at least compared to oak wilt or Dutch elm disease, and it may take years for it to develop in a tree and cause dieback and mortality. The epidemiology of this disease in the East is unknown and the effects in native stands with diverse tree populations may be quite different than in planted stands out west.

Management options need to be considered, developed and refined. Perhaps a containment/mitigation effort could buy valuable time to develop means of managing it and finding resistant cultivars.

At this point, USDA APHIS has NOT designated TCD as a federally regulated pest.

Next week some of the TCD experts from Colorado State University will be visiting the Knoxville site and advising the forest health specialists on all aspects of TCD management.

Wesley (Wes) Nettleton, Director
Forest Health Protection
USDA Forest Service
 
I was going to try and give my local forestry office a call and see what their take on this is. It makes me ponder a more widespread cut on my place to get the mature walnut and ash.
 
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