ForesTree - A Guide to Tree Health

Pest and Disease Information

Incense Cedar
  • Calocedrus decurrens - Resistant to Oak Root Fungus. Susceptible to Beetle Borers, Juniper Scale and Western Cedar Bark Beetle, Mistletoe, Phytophthora, Root Rot, Red Ring Rot, Schweinitzii Butt Rot, Pitted Sap Rot, Oak Root Rot, Incense-cedar Rust and Rust. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (243) | Silvics of North America
9 Records Found
Disease or Pest NameDescription of Disease or Pest

Annosus root disease
Heterobasidion annosum

Heterobasidion_annosumSymptoms of Annosus root disease include fading of crowns to light green, thinning crowns, chlorotic foliage, reduced height growth, and ultimately death. Trees affected often occur as small groups. As t...

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...

Pitted sap rot, purple conk
Trichaptum abietinum

trichaptum_abietinumThe fruiting bodies (conks) have a purple lower surface. They are 1-3 cm wide with an upper surface which is grey and hairy.

Red ring rot
Phellinus pini

Phellinus_piniRed ring rot sporophores (conks) are hard, woody, and perennial. They are hoof shaped to bracket like and appear anywhere on the trunk of the affected tree. The upper surface of the conk is zoned and li...

Schweinitzii Butt Rot
Phaeolus schweinitzii

Phaeolus_schweinitziiThe annual fruiting bodies most commonly form on the ground around affected trees in the late summer. They have a spongy, leathery texture and appear shelf-like on the stem and stipitate when growing on t...

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 ...

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 ...