Tennessee News

New Large Surviving American (LSA) Chestnut Found in Cannon Co.

TN Chapter members Vicki Turner, Jack Torkelson, and Joe Schibig met up with Mark Vance in Cannon County, TN on Dec. 4 to see a newly discovered large surviving American (LSA) chestnut tree. The weather was great, and Mark took the group, which also included Joe Bryson with the TN Division of Forestry, to a healthy American chestnut, which was perched on a steep upper west-facing slope surrounded by fairly large trees. There were lots of huge sassafras trees close to it as well as big sourwood, tulip poplar, hickories and oaks. The tree was approximately 9-10 inches dbh and about 40 feet tall. It appeared to be relatively healthy, but there was a swollen canker at its base. TN Chapter President Joe Schibig thought that it would be a good idea to mound some local soil (mud pack) around its base to inhibit the growth of Cryphonectria. Joe also felt that it should be fairly easy to obtain male flowers from this tree next June and that the flowers will be within reach of a Jack’s long pole pruner and ladder.

Everyone was delighted by the discovery of this relativiely large and healthy American chestnut tree. Mark Vance discovered the tree by perusing the area after he spotted a dead chestnut leaf on the ground. After finding hundreds of American chestnut sprouts in Mammoth Cave National Park a few years ago, he developed a keen eye for spotting chestnut trees.

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The 2024 Tennessee Chapter Pollination Workshop was held on June 8 to great success, bringing together 22 enthusiastic volunteers for a day of hands-on learning at the Tennessee Tech Orchard. Established in 2005 using the direct seed planting method, the TTU backcross orchard includes a row of robust, blight resistant F1 hybrids, resulting from a 2004 cross between a naturally occurring Clay County, TN American chestnut, and the Chinese cultivar ‘Gideon.’ These F1s (originally planted as controls in the 2005 backcross orchard), in addition to their blight resistance, exhibit promising resistance to Phytophthora cinnamomi (causal agent of the phytophthora root rot disease, PRR), which has been validated through progeny tests and PRR-screening (Perkins et al., 2019). They were chosen to be the female parents this year in crosses designed to move PRR resistance into the best selections of the southern TACF chapters.

During the 2024 workshop, participants heard a short lecture from Dr. Craddock on the pollination biology of Castanea species and saw an active demonstration of emasculation and bagging of chestnut flowers. They learned about the importance of proper labelling and the labelling conventions of the TACF chapter breeders. They were then engaged directly in hand the pollination techniques used to create hybrid chestnut trees using pollen provided by colleagues in the Georgia, Carolinas, and Alabama chapters ladders and bucket lifts to access the crowns of the trees, successfully performing hundreds of pollinations.
The workshop's outcome was exceptional. The volunteers completed 27 distinct crosses. Fruit set was excellent despite the late summer drought. The burs were harvested in September yielding 2,553 hand pollinated seeds! These efforts advance the TACF breeding program's goal of stacking resistance to both Phytophthora cinnamomi and Cryphonectria parasitica, ensuring future generations of resilient chestnut trees well adapted to conditions here in the South. Volunteers left with hands-on experience, new knowledge, and a sense of accomplishment, with many eager to apply their skills in their own orchards.

Perkins, M.T., Robinson, A.C., Cipollini, M, and Craddock, J.H.. (2019) Identifying host resistance to Phytophthora cinnamomi in hybrid progeny of Castanea dentata and Castanea mollissima. HortScience 54(2): 221-225. doi.org/10.21273/HORTSCI13657-18
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The 2024 Tennessee Chapter Pollination Workshop was held on June 8 to great success, bringing together 22 enthusiastic volunteers for a day of hands-on learning at the Tennessee Tech Orchard. Established in 2005 using the direct seed planting method, the TTU backcross orchard includes a row of robust, blight resistant F1 hybrids, resulting from a 2004 cross between a naturally occurring Clay County, TN American chestnut, and the Chinese cultivar ‘Gideon.’ These F1s (originally planted as controls in the 2005 backcross orchard), in addition to their blight resistance, exhibit promising resistance to Phytophthora cinnamomi (causal agent of the phytophthora root rot disease, PRR), which has been validated through progeny tests and PRR-screening (Perkins et al., 2019). They were chosen to be the female parents this year in crosses designed to move PRR resistance into the best selections of the southern TACF chapters.

During the 2024 workshop, participants heard a short lecture from Dr. Craddock on the pollination biology of Castanea species and saw an active demonstration of emasculation and bagging of chestnut flowers. They learned about the importance of proper labelling and the labelling conventions of the TACF chapter breeders. They were then engaged directly in hand the pollination techniques used to create hybrid chestnut trees using pollen provided by colleagues in the Georgia, Carolinas, and Alabama chapters ladders and bucket lifts to access the crowns of the trees, successfully performing hundreds of pollinations.
The workshops outcome was exceptional. The volunteers completed 27 distinct crosses. Fruit set was excellent despite the late summer drought. The burs were harvested in September yielding 2,553 hand pollinated seeds! These efforts advance the TACF breeding programs goal of stacking resistance to both Phytophthora cinnamomi and Cryphonectria parasitica, ensuring future generations of resilient chestnut trees well adapted to conditions here in the South. Volunteers left with hands-on experience, new knowledge, and a sense of accomplishment, with many eager to apply their skills in their own orchards.

Perkins, M.T., Robinson, A.C., Cipollini, M, and Craddock, J.H.. (2019) Identifying host resistance to Phytophthora cinnamomi in hybrid progeny of Castanea dentata and Castanea mollissima.  HortScience 54(2): 221-225. https://doi.org/10.21273/HORTSCI13657-18Image attachmentImage attachment+1Image attachment

Join us TODAY, Friday, August 16, 2024, from 11:30AM – 1:00PM (ET), for the next LIVE Chestnut Chat.

Special guests Tony D’Amato and Tim Stout will discuss the role of the American chestnut in forest management strategies that address the impacts of climate change and invasive insects and pathogens on eastern forests. Tony will provide an overview of the frameworks and approaches under evaluation and Tim will bring it to a landowner scale by discussing the strategies being tested and applied on his farm in Shrewsbury, Vermont.

To sign up, visit tacf.org/event/chestnut-chat-adaptive-silviculture-for-climate-change/
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Join us for Chestnut Chat's 50th Episode Spectacular next Friday, July 19th at 11:30AM ET.

Click the link to learn more about or sign up for this webinar. tacf.org/event/chestnut-chat-50th-episode-spectacular/
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