JUNIPER DISEASES

By The Old House Web

JUNIPER DISEASES

List of files and visuals associated with this text.


Twig blight causes death and browning of twigs tips. The disease may progress down the stem killing the whole branch. Small lesions may be seen at the base of dead tissue. 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. Removing the ice is impractical and it usually melts before injury occurs.

Visuals associated with this text.

Visual title - Visual size Visual title - Visual size
Cedar Apple Rust - 40K Cedar apple rust gall on juniper - 35K
Cedar apple rust gall on juniper, spore horns - 64K Cedar apple rust gall on juniper, spore horns mature and drying - 28K
Phomopsis juniper blight - 42K Phomopsis juniper blight, twig canker - 46K
Phomopsis juniper blight, tip dieback - 16K Spittle bug on juniper - 24K
Spittle bug on juniper - 29K Spittle bug - 21K
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