I have a fantastic escallonia hedge around my garden for the last eight years. This year however it has deteriorated. You can practically see through it in patches, where it should be solid green throughout the year. Please can you give me any idea what to treat it with as it seems to be spreading. I attach a photo. I really look forward to your reply.
Sometimes diseases have a very favourable spell of weather and afterwards, they do not present the same problem again, but often the problem becomes chronic, and in this case, the shrub may have to be removed.