Posted: 06/10/2017 at 19:21
How was the soil prepared for them, and how have they been cared for since planting?
I think the problem is more likely to be cultural (soil, conditions, care etc) rather than any beasties doing them in. That being said, the loss of a few small sprigs is usually nothing to worry about. What proportion of the trees has gone brown?
Can we have a photo of the whole row of trees, including the base please.