Our results from two Ash tree nurseries, using highly-genetically controlled techniques, show there is a large genetic variation between different clones. No clone is completely unaffected, but some have much higher resistance than the other. Therefore there seems to be good prospects for using traditional forest tree breeding to create a forest of reproductive material of ash that is less sensitive to Ash Die Back.

Given the high risk of ash regeneration killed by the fungus, ash should not be considered for planting today. In affected populations it is recommended that severely infected trees are cut away. They are obviously very susceptible to the disease and will then also be vulnerable in the future. If the problem of infection is likely to continue, it may be necessary to change to an alternate species. For example, the oak as an alternative for chippings and you can select alder in suitable wetter locations.

The next step is to focus on finding vital trees in heavily damaged stocks. The most vital trees will then be used in a new seed orchard in order to produce planting material with high resistance to ash die back.