Biological Control Released At Martha Sundquist State Forest To Protect Hemlocks

Wednesday, December 5, 2012

Predatory beetles that feed on hemlock woolly adelgids (HWA), an invasive pest killing swaths of hemlock trees from eastern Tennessee to the Cumberland Mountains, were released Tuesday at Martha Sundquist State Forest in Cocke County. The release was an effort by the Tennessee Department of Agriculture Division of Forestry (TDF) to protect young eastern hemlock seedlings from the invasive exotic pest, which is responsible for killing many, if not most, of the mature hemlocks in the state forest.

“Martha Sundquist State Forest is a good site for these beetles to be released because there is a healthy population of HWA to sustain them,” said Douglas Godbee, TDF Forest Health Forester. “We will monitor these beetles over the next couple of years in hopes that they will reproduce, become an established population, and continue to prey on HWA in order to eventually control the HWA population.”

Native to Asia, the hemlock woolly adelgid (Adelges tsugae) is a small, aphid-like insect that threatens the health and sustainability of eastern hemlock (Tsuga canadensis) and Carolina hemlock (Tsuga caroliniana) in the Eastern United States. It feeds at the base of the needles and can quickly populate all needles of a tree, sucking the sap and ultimately causing mortality within 3 to 10 years of infestation. The potential ecological impacts of this exotic pest are comparable to that of Dutch elm disease and chestnut blight. HWA was first reported in the U.S. in 1951 near Richmond, Va., and has since spread to 17 states, from Maine to Georgia. 

The predatory beetles, Laricobius nigrinus, are especially good at controlling HWA because its lifecycle syncs with HWA’s lifecycle, as the larvae feed exclusively on HWA eggs and can only complete their development on HWA eggs. They were reared by the University of Tennessee Institute of Agriculture at the Lindsay Young Beneficial Insects Laboratory.

Since its detection in Tennessee in 2002, HWA has spread to 35 counties in East Tennessee and the Cumberland Plateau. On average, HWA has been spreading from east to west at roughly 15 to 20 miles per year. It is estimated to have been in Martha Sundquist State Forest since 2005.

“Martha Sundquist State Forest has a healthy population of younger hemlock trees but if left untreated, these trees will eventually become infested and die,” said Mr. Godbee.

HWA is spreading rapidly by storm winds and migratory birds, as well as “hitchhiking” on mammals and humans. Infested nursery stock can also transport the insect into new areas. Hemlock is not a highly valued timber species but provides invaluable ecological benefits to the forest such as habitat, stream temperature regulation, and stream bank stability. Loss of these benefits not only disrupts the delicate natural systems in the forest but also affect aesthetic and recreational benefits.

Agencies across Tennessee have joined together in the fight against the hemlock woolly adelgid and formed The Tennessee Hemlock Conservation Partnership. The group works to track the rate of spread of HWA across the state, collaborate on HWA treatment projects on public land, and educate the public about HWA. More information can be found at www.protecttnforests.org or contact the Division of Forestry, Forest Health at 615 837-5432

For more information about other programs and services of the Tennessee Department of Agriculture visit www.tn.gov/agriculture


Riverpark Boat Ramp Closed Due To Rising Water

Summary Of Deer Management Plan Presented During TFWC's December Meeting

2019 Spring Turkey Quota Hunts Application Period Is Dec. 12-Jan. 16


The Riverpark Boat Ramp has been closed due to rising waters. The fishing piers remain open. (click for more)

The Tennessee Wildlife Resources Agency’s five-year strategic deer management plan was presented during the Tennessee Fish and Wildlife Commission’s final meeting of 2018. The two-day meeting ... (click for more)

The application period for the Tennessee Wildlife Resources Agency 2019 Spring Turkey Quota Hunts is Dec. 12 through Jan. 16. Applications are available and will be accepted at any TWRA license ... (click for more)


Outdoors

Riverpark Boat Ramp Closed Due To Rising Water

The Riverpark Boat Ramp has been closed due to rising waters. The fishing piers remain open. (click for more)

Summary Of Deer Management Plan Presented During TFWC's December Meeting

The Tennessee Wildlife Resources Agency’s five-year strategic deer management plan was presented during the Tennessee Fish and Wildlife Commission’s final meeting of 2018. The two-day meeting concluded Friday at the TWRA’s Region II Ray Bell Building in the Ellington Agricultural Center. The strategic deer management plan has six major goals. This includes gathering more information ... (click for more)

Breaking News

Ooltewah Residents Ask Sewage Treatment Plant Go In Meigs County Instead; WWTA Says Growth To Be Stymied Without Plant

An overflow crowd of Ooltewah residents opposed to a sewage plant "in their back yard" recommended on Wednesday that it go further north, perhaps Meigs County where TVA is building a major power center. Officials of the Hamilton County Water and Wastewater Treatment Authority (WWTA) said Mahan Gap Road is the best location and least expensive. Without a new plant, development ... (click for more)

Earthquakes Hit Tennessee Valley Early Wednesday Morning

Two earthquakes happened early Wednesday morning just north of Chattanooga, awakening many early in the morning. The earthquakes registered at 4.4 and 3.3 magnitudes at 4:27 a.m. Some people felt them in North Chattanooga and Ooltewah. They were also felt as far away as Atlanta and Nashville. The epicenters were at Spring City and Ten Mile. The quakes were the strongest ... (click for more)

Opinion

Alstom And Tubman: A Tale Of Two Sites

The former Alstom industrial site on the riverfront and the former Harriett Tubman housing site in East Chattanooga both have a lot of redevelopment potential. And yet the city of Chattanooga seems to view them quite differently. Alstom is the fair-haired child; Tubman is the forgotten child. The Alstom area was recently designated as an "opportunity zone" in a new program ... (click for more)

Roy Exum: We're Torturing Millions

I’ll admit it – I would rather hurt than take an opioid pain pill. Hydrocodone and its cousins scare the willies out of me because once when I was ‘drug sick,’ it was the worst sickness I have ever known. For somebody who always has somewhere that it hurts, I know that opioids are wonderful when used properly but because they are increasingly abused by society, there are now over ... (click for more)