Prune out dead branch tips. Three rust diseases seen most often are cedar-apple rust, hawthorn rust, and quince rust. The most common is the first. On juniper the disease forms galls that form orange jelly like horns in spring. The horns are most likely to form following periods of rainy, warm weather.
Spores formed in the horns infect the alternate host.
The diseases are more serious on the alternate host than juniper. A separation of a few hundred yards will help control the disease. Prune out the spore horns when seen in the spring. Junipers are not tolerant of ice coatings. Expect dieback when junipers are covered with ice for several days.