A fungus is going to kill 90% of the UK's ash trees. Should genetic modification be used to make ash trees that can survive the fungus?

It seems plausible to me. These trees won't be fed to people, and pesticide won't be used on them; that eliminates two of the main issues. Furthermore, since the wild type is being wiped out anyway, there is no need to be concerned that it will be contaminated by the inserted gene.