Chestnut is being rescued by a two-pronged approach using hybridization (with a resistant asian species, followed by backcrosses to get something that is mostly

Chestnut is being rescued by a two-pronged approach using hybridization (with a resistant asian species, followed by backcrosses to get something that is mostly American Chestnut) and genetic engineering (introducing a wheat gene that destroys oxalate, which the fungus uses to kill tissue.)