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Diseased conifer
I have five corkscrew shaped conifers, all in various places in my garden. All of them to a degree have dry dead patches from the middle to the top. Can any body suggest what is wrong?
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They may have conifer aphid. Since there is no issue with flowers, you could try spraying with a systemic insecticide to stop the brown spreading.
Brown areas will not green up again, so you will need to cut them out and train fresh growth into the area.