In 2001, rootstock from the Coffea liberica species was found to be resistant to the nematodes.
In 1912, Ronald Hatton initiated the work of classification, testing and standardization of apple tree rootstocks.
The MegaFlora Tree is claimed to be a trademarked name for a fast-growing tree created by Emerald Energy, however no such trademark has been granted, and the process reportedly being used to 'create' the trees is grafting of Pauwlonia trees onto Black Locust rootstock, rather than through any "DNA sharing" or creation of a "hybrid-cross" tree.