Friday, December 22, 2017

Roasting chestnuts may make a comeback

It’s been about a century since Americans have been able to celebrate the holidays by roasting native chestnuts over an open fire. Almost every one of America’s more than 4 billion chestnut trees from Maine to Georgia was wiped out by chestnut blight, a fungal disease that spread like wildfire after its accidental introduction into the U.S. from trees imported from Japan to the Bronx Zoo in 1904.
The tree’s disappearance has dramatically changed the landscape of eastern North America. Chestnuts were once the dominant tree in eastern forests, and its wood was used for fence posts, railroad ties, utility poles and anything else that required rot-resistant lumber.
American chestnut tree, via The Rural Blog
Many of Rhode Island’s historic homes were once sheathed in it.
In addition, the edible nuts provided vital nutrition to wildlife and were an important element in cattle and hog feed. And because the nuts ripened right around Thanksgiving, they became a popular snack during the holiday season (and a key lyric in that most popular of Christmas carols).
All but the caroling ended soon after the blight took hold. The few chestnuts we eat these days come from non-native species imported from overseas.
But that may not be the case in the coming years, thanks largely to efforts by the American Chestnut Foundation and a little help from local volunteers. A number of research projects are underway designed to develop blight-resistant trees so the species can be restored in our forests.
URI Master Gardener Rudi Hempe is one of the volunteers. He and a team of about 25 other master gardeners who call themselves Rudi’s Rangers are growing a one-acre breeding orchard and a two-acre seeding orchard of chestnut trees on land owned by the South Kingstown Land Trust.
The trees they planted originated with seeds from a single tree in East Greenwich and another one in Exeter that apparently have a genetic abnormality that makes them immune to the blight. Those two parent trees are among the very few mature American chestnuts that did not succumb to the disease, and they are giving scientists a starting point for studying disease resistance.
When the trees planted and maintained by the master gardeners grow tall enough, Rudi’s Rangers will inoculate them with a low-dose of the blight in hopes that some will develop a resistance to the disease. Similar efforts are underway at three other locations in Rhode Island and at dozens more in Massachusetts, Maine and elsewhere in the tree’s original range.
In a separate study, the chestnut foundation is also crossing American chestnuts with a similar species from China that is naturally resistant to the disease. Five of those hybrid trees were planted at URI’s East Farm several years ago, and three of them are still going strong.
It is uncertain whether any of these studies – or others approaching the problem using biotechnology tools – will bear fruit. It’s likely to take a decade or more to find out. But we’ve waited far longer than that already. The wild trees have been gone for so long that almost no one alive today has any recollection of how stately a chestnut forest looked before the blight.
But hopefully, in the not too distant future, singing about roasting chestnuts will have a new, deeper meaning to carolers – and all Americans – once the majestic trees make their heralded return.

This article first appeared in the Independent on December 21, 2017. 

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