Connecticut news

2012 Summary Report on Orchard Operations

By Bill Adamsen
Member CT Chapter TACF

2012 Summary Report on Orchard Operations

The purpose of this report is to present the Connecticut Chapter of the American Chestnut Foundation® summary of breeding orchard success following close of 2012. The Connecticut Chapter currently operates seven orchards widely distributed across Connecticut in which we planted almost four thousand trees. We planted our first back-cross orchards in April of 2006 in the Towns of Woodbridge and Salem. We added at least one new orchard each year through 2010. The majority of trees in those seven orchards are about 92% American and balance Chinese, with the latter representing the opportunity to provide resistance to the Chestnut blight. This successful effort represents a huge milestone for a volunteer-run organization!

Table 1

(Click table see larger version) shows the total number of trees we’ve grown in our back-cross orchards since those first planting. These include control trees such as pure or open-pollinated American chestnut, in addition to F1 hybrids and pure Chinese chestnuts. The overwhelming majority of trees planted are back-cross American chestnut with predominantly genes of CT origin. The chart shows summary values for the number of trees planted and surviving, as well as values for height and diameter breast height (dbh) for known values. Not all of the orchards have reported values for dbh and height for 2012.
Table 1. CT Program Overview – table of total plantings

Summary Report[click for larger photo]
Table 1. CT Program Overview
table of total plantings


Table 2

(Click table see larger version) details the various types of trees planted in the research orchards and summarizes that data. As mentioned, those types include F1 (Chinese/American hybrid), American chestnut (either of known type or open pollinated) and also pure Chinese chestnut. These non-backcross types are planted to serve as controls for resistance inoculation. In inoculation, trees of a sufficient size are inoculated with a blight inoculum of known virulence. The trees inoculated represent a continuum of expected resistance to the blight from strong – Chinese, F1 Hybrid, Back-cross, and American – to weak. By inoculating at the same time, this range of resistance facilitates evaluating which of the back-cross trees are most resistant, and to what degree. Table 2 shows the different types planted in each orchard, by year and then summarizes by type, year and also orchard. Table 2. CT Program Summary – Summary table of total plantings

Summary Report[click for larger photo]
Table 2. CT Program Summary *
Summary table of total plantings


Table 3

(Click table see larger version) details the back-cross lines planted in TACF® CT Orchards. Any resistant trees available for future planting would be bred from progeny of our back-cross orchards. The goal of the TACF® regional diversity program is to plant twenty lines – each line representing the capturing of genes of a local validated American chestnut through pollination of a local mother tree. Since some of the lines were split – planted in two orchards – one must be careful not to double count lines. The records show that we have 24 lines planted, but only seventeen of those are complete … requiring additional pollinations with pollen from the same lines of resistance. Always more work to do!
Table 3. CT Back-cross Trees – table of back-cross plantings

Summary Report[click for larger photo]
Table 3. CT Back-cross Trees
table of back-cross plantings


Should you have questions about the program, or have an interest in getting involved, please contact TACF® Regional Science Coordinator Kendra Gurney to start a conversation. And of course we always look forward to meeting new supporters and participants who are interested in returning Chestnut to a position of ecological importance in the forests of CT.

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Lucinda’s got a tree to introduce you to 🌳👋
Meet even more trees at tacf.org/meet-the-trees/
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2 CommentsComment on Facebook

This is D1-3-59 if you'd like to view it on our webpage!

Thanks. I have one from OIKOS that was advertised as 95% American. Here's the trunk -- alittle blight on the lowest branch at left, but that's been yrs ago and has healed over. It's been putting out male pollen racemes, but they don't open (become fuzzy) -- don't know why.

Reminder! TACF's 2025 American Chestnut Photo Contest is going on now, with a new, extended deadline!

The first-place winner will have their photo featured on the cover of a future issue of Chestnut magazine and receive a one-year TACF membership, along with a T-shirt and hat. The second-place winner will receive a T-shirt and sticker, and the third-place winner will receive a sticker. All winners will be recognized in a future issue of Chestnut.

Visit tacf.org/2025-photo-contest/ for all the details.
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Reminder! TACFs 2025 American Chestnut Photo Contest is going on now, with a new, extended deadline! The first-place winner will have their photo featured on the cover of a future issue of Chestnut magazine and receive a one-year TACF membership, along with a T-shirt and hat. The second-place winner will receive a T-shirt and sticker, and the third-place winner will receive a sticker. All winners will be recognized in a future issue of Chestnut.Visit https://tacf.org/2025-photo-contest/ for all the details.

Celebrate the legacy of Rex Mann—forester, storyteller, and passionate champion for the American chestnut—with this limited edition Leave Tracks t-shirt.

Rex devoted his life to restoring forests and inspiring others to care for the land. Now, you can honor his memory and help carry his mission forward.

🌳 100% of the proceeds from every shirt go to The American Chestnut Foundation (THANK YOU!), supporting the work Rex believed in so deeply.

👉 Pre-order now through August 2: scottmann.com/store/Leave-Tracks-In-Honor-of-Rex-Mann-PREORDER-p768130686

Let’s keep walking the trail Rex helped blaze.
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Celebrate the legacy of Rex Mann—forester, storyteller, and passionate champion for the American chestnut—with this limited edition Leave Tracks t-shirt.Rex devoted his life to restoring forests and inspiring others to care for the land. Now, you can honor his memory and help carry his mission forward.🌳 100% of the proceeds from every shirt go to The American Chestnut Foundation (THANK YOU!), supporting the work Rex believed in so deeply.👉 Pre-order now through August 2: https://scottmann.com/store/Leave-Tracks-In-Honor-of-Rex-Mann-PREORDER-p768130686Let’s keep walking the trail Rex helped blaze.

We’re excited to share a new animated video explaining TACF’s RGS program! ... See MoreSee Less

Video image

1 CommentComment on Facebook

Transgenic American Chestnuts are still a much better option. The product of this method will always be a hybrid and that should not be the goal.

One of the greatest ecological disasters the US has ever seen. Chestnut blight wiped out the American chestnut tree in less than 50 years.⁠
A tree that once made up nearly 25% of the eastern forests was reduced to a functionally extinct species.⁠

The Asian fungus Cryphonectria parasitica was accidentally introduced into the United States in the late 1800s. While a few diseased chestnuts were noted in the 1880s and 90s, it wasn't until 1904 that the pathogen was identified in New York City. From that point, the blight spread rapidly. By 1950 the entire range had been consumed.⁠

The fungus causes cankers that spread around the trunk of the tree, girdling it and killing everything above ground. Many root systems still survive today and continue to send up shoots, but these also eventually succumb to blight. Because American chestnuts rarely survive long enough to reproduce, the species is considered functionally extinct.⁠

The American Chestnut Foundation is working to develop blight-resistant American chestnuts that can be used to restore this iconic tree to its native range. Learn more at tacf.org/about-us (link in bio)
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145 CommentsComment on Facebook

I think I may have found an American Chestnut tucked away in a backyard

Incredibly important work…it was such a travesty for our forests!

The trees seem to still be intact outside their range in isolated areas. Theres a few large ones here in central Michigan on a peninsula and again on the Leelenau peninsula in the nw lower peninsula. I keep seeing people chime in about adult trees here and there. Seems like there's hope!

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