ForesTree - A Guide to Tree Health

Pest and Disease Information

Western Juniper
  • Juniperus grandis - Resistant to Texas Root Rot. Susceptible to Beetle Borers and Spider Mites, Oak Root Rot, Root Rot and Rust. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (757) | Silvics of North America
7 Records Found
Disease or Pest NameDescription of Disease or Pest

Incense-cedar Rust
Gymnosporangium libocedri

Gymnosporangium_sppThe incense-cedar rust forms orange, gelatinous masses on stunted and bushy branches. These are actually galls and may cause stem dieback.

Oak root fungus
Armillaria mellea

Armillaria_melleaArmillaria cases reduced terminal growth and general decline in affected plants, As the Armillaria advances dieback of twigs and branches (most apparent in hardwoods) can occur. Crown symptoms include chl...

Phytophthora Root and Crown Rot
Phytophthora cactorum

phytophthora_cactorumThis disease, as its name implies, is characterized by red-brown exudate oozing from bark fissures in cankers on lower parts of the mainstem of the tree. Wood behind the wet areas is dead and stained reddi...

True Mistletoe
Phoradendron juniperi

Phoradendron_juniperiTrue mistletoe is an evergreen parasitic plant with developed stems and leaves. In this species the leaves are much reduced. The infection causes swollen branches and brooming. Most infections start in ...

Juniper scale
Carulaspis juniperi

carulaspis_juniperiJuniper scale attacks leaves, twigs, branches and cones causing the foliage to become chlorotic. With heavy infestations, branches and even trees may die. Sooty mold is often present in association with ...

Spruce spider mite
Oligonychus ununguis

Oligonychus_ununguisThe spruce spider mite feeds on foliage. It is a common pest of ornamentals and thrives under hot, dry conditions. The adults are green, pink, or brown and occur mostly on older needles. Needles first a...

Western cedar bark beetle
Phloeosinus punctatus

Phloeosinus_spp_galleriesGenerally the western cedar bark beetle is not too aggressive and the beetles work under the bark of trunks, tops, and limbs of weakened trees. They may cause mortality during drought. Adult beetles are ...