In this Wednesday, Oct. 10, 2012 photo, Traylor Renfro holds two burs from an American chestnut tree, center, on his property in Grassy Creek, N.C. (AP Photo/Allen Breed)

Associated Press
In this Wednesday, Oct. 10, 2012 photo, Traylor Renfro holds two burs from an American chestnut tree, center, on his property in Grassy Creek, N.C. (AP Photo/Allen Breed)
In this Wednesday, Oct. 10, 2012 photo, Traylor Renfro holds two burs from an American chestnut tree, center, on his property in Grassy Creek, N.C. (AP Photo/Allen Breed)
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