ForesTree - A Guide to Tree Health

Pest and Disease Information

White Fir
  • Abies concolor - Resistant to Oak Root Fungus. Susceptible to Aphids, Fir Engraver Beetle, Bagworm, Cottony Cushion Scale, Balsam Twig Aphid, Spruce Spider Mite and Beetle Borers, Mistletoe, Oak Root Rot, Root Rot, Indian Paint, Cytospora and Rust. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (3) | Silvics of North America
11 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...

Cytospora canker
Cytospora abietis

Cytospora_abietisCytospora canker causes a necrotic area/canker on bark or branch leading to sunken lesions on weakened trunks and branches. The discolored area becomes watery and foul smelling. Fruiting bodies are pin siz...

Dwarf Mistletoe
Arceuthobium abietinum

shootsSmall, yellow, leafless parasitic flowering plants. Reduces tree vigor (yellowing foliage) and can lead to mortality.

Indian paint
Echinodontium tinctorum

Echinodontium_tinctorumIndian paint fungus is a wood decay organism. Indicators of its presence include fire scars, dead and broken tops, dwarf mistletoe cankers, frost cracks and other wounds, The hoof shaped conk has a grey ...

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...

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 pauciflorum

phoradendron_pauciflorumTrue mistletoe is an evergreen parasitic plant with developed stems and leaves. The infection causes swollen branches and brooming. Most infections start in the upper crown of the tree, since the plant i...

Balsam twig aphid
Mindarus abietinus

Mindarus_abietinus_adultThe balsam twig aphid is greenish yellow, powdery and 1 to 2 mm long. It feeds on developing new needles and twigs causing them to twist and fall prematurely. New spring growth is stunted and bark defor...

Carpenter ant
Camponotus spp.

adultCarpenter ants tunnel in the wood of stumps, logs, and standing dead trees. They are black or black and red and are 7 to 15 mm long. They do not eat the wood, feeding mostly on other insects. They have ...

Douglas-fir tussock moth
Orgyia pseudotsugata

orgyia_pseudotsugataThe Douglas-fir tussock moth prefers Douglas-fir and white fir in California, but will attack other firs and pines when mixed with the preferred hosts. The adult is a dull brownish-gray moth and the femal...

Fir engraver beetle
Scolytus ventralis

Scolytus_ventralisThe fir engraver is a major pest of true firs in the western US. It attacks trees from pole-size to full maturity. Outbreaks frequently follow drought. Trees weakened by diseases and other pests are esp...