Robinia pseudoacacia 'Frisia' problems
Seventeen years ago we planted a Robinia pseudoacacia 'Frisia' and last year I noticed the upper braches failed to come into leaf in the Spring. This year the top half has failed to come into leaf. I have heard of many other Frisias having the same problem and wondered about pruning out the top growth. As this RHS article states, it does seem there is no cure. Sad.