In this Friday, Oct. 19, 2012 photo, tree geneticist Paul Sisco leads members of The American Chestnut Foundation on a hybrid orchard tour outside Asheville, N.C. All claims of a naturally resistant American are "baloney," said Sisco, a retired American Chestnut Foundation staff geneticist. (AP Photo/Allen Breed)

Associated Press
In this Friday, Oct. 19, 2012 photo, tree geneticist Paul Sisco leads members of The American Chestnut Foundation on a hybrid orchard tour outside Asheville, N.C. All claims of a naturally resistant American are "baloney," said Sisco, a retired American Chestnut Foundation staff geneticist. (AP Photo/Allen Breed)
In this Friday, Oct. 19, 2012 photo, tree geneticist Paul Sisco leads members of The American Chestnut Foundation on a hybrid orchard tour outside Asheville, N.C. All claims of a naturally resistant American are "baloney," said Sisco, a retired American Chestnut Foundation staff geneticist. (AP Photo/Allen Breed)
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