@leedwaters4D-HyZ9M I would like to be able to reassure you but without knowing exactly what it is I cannot comment on it's future spread. It isn't certain that the problem is fungal. If you do have to continue cutting away you will leave gaps from which it may not grow unless it is a Thuja. If you can imagine how difficult it would be to spray, it will go everywhere and I am not sure if it would be enough, you may have to repeat. Just try spraying some water most will land on you. If you are near to an RHS garden they might be able to ID the problem but it may only be something that is seen under a microscope. When you prune conifers there is always a risk that brown areas will be revealed these are areas that are no longer in the sun. I hope with rain to encourage new growth there will be some improvement. I should say that I do garden organically.
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
It does look like Thuja to me, but l couldn't say l'm 100% certain. The bare stems look more like Leylandii, similar to some shown in a garden on GW a few weeks ago. (Edited to add might have been Beechgrove 😊).
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If you are near to an RHS garden they might be able to ID the problem but it may only be something that is seen under a microscope.
When you prune conifers there is always a risk that brown areas will be revealed these are areas that are no longer in the sun. I hope with rain to encourage new growth there will be some improvement.
I should say that I do garden organically.
The bare stems look more like Leylandii, similar to some shown in a garden on GW a few weeks ago.
(Edited to add might have been Beechgrove 😊).