I’m pretty sure the transgenic ones are going to get FDA approved in the next 2 years. All they changed was 1 gene. It doesn’t even kill the blight...it just allows the tree to be able to handle the acid it produces. Studies so far show that it doesn’t change anything with beneficial forest fungus, bee pollination, leaf litter decomposition, etc. Frog tadpoles have a higher survival rate in water with the chestnut leaf litter versus those from leaves from other trees too. Makes you wonder how much of the frog decline is due to that too. Anyway, they’re coming. Just gotta save the elm, ash, and hemlock now.