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Junipers can suffer from root or crown rot if the soil doesn't drain well, especially in the winter months. Or your juniper may be infested with spider mites. As these pests feed, they kill the leaves. Look for webbing along the stems and leaves. If you find none, then check the root system of your juniper. Healthy roots are creamy white inside; dead or dying roots are rusty colored or mushy.
I'd prune the juniper back, both to remove the unattractive foliage and to encourage new growth.
Best wishes with your juniper!
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