Developing vegetative propagation techniques
The trees in the National Archive are grafted on to rootstocks of common ash. This is because grafting yields very high success rates (over 95%). However, there is no guarantee that the rootstock is of tolerant material, and research has shown that ash can be infected through pores in the stem/ bark called lenticles, particularly when inoculum levels are high. It is preferable to have tolerant selections on their own roots to eliminate this step. Work in the original project looked at tissue culture, but costs are expensive and while getting plantlets from seed was straight forward, less success was obtained with shoot material. Here we will investigate vegetative propagation techniques for ash, to yield consistently high results which currently is hard to achieve without grafting.