| Disease or Pest Name | Description of Disease or Pest |
|
Dwarf Mistletoe
Arceuthobium douglasii |
Small, yellow, leafless parasitic flowering plants. Reduces tree vigor (yellowing foliage) and can lead t... |
|
Oak root fungus
Armillaria mellea |
Armillaria cases reduced terminal growth and general decline in affected plants, As the Armillaria advanc... |
|
Phytophthora Root and Crown Rot
Phytophthora cactorum |
This disease, as its name implies, is characterized by red-brown exudate oozing from bark fissures in can... |
|
Pitch Canker
Fusarium circinatum |
Pitch canker causes cankers/necrotic areas of bark on the main stem and lateral branches of affected tree... |
|
Pitted sap rot, purple conk
Trichaptum abietinum |
The fruiting bodies (conks) have a purple lower surface. They are 1-3 cm wide with an upper surface wh... |
|
Red fomes rot
Fomitopsis cajanderi |
This wood decay forms perennial, woody, bracket-like to hoof shaped conks on the trunk of affected trees.... |
|
Schweinitzii Butt Rot
Phaeolus schweinitzii |
The annual fruiting bodies most commonly form on the ground around affected trees in the late summer. Th... |
|
Sudden Oak Death
Phytophthora ramorum |
Phytophthora ramorum causes two types of symptoms on affected plants. In some it causes bleeding cankers... |
|
Black pineleaf scale
Nuculaspis californica |
Outbreaks of black pineleaf scale are often associated with smog and dust. The insect feeds only on the ... |
|
Carpenter ant
Camponotus spp. |
Carpenter ants tunnel in the wood of stumps, logs, and standing dead trees. They are black or black and ... |
|
Douglas fir beetle
Dendroctonus pseudotsugae |
The Douglas-fir beetle often kills trees in small groups. Many times these trees are weakened by fire, d... |
|
Douglas-fir tussock moth
Orgyia pseudotsugata |
The Douglas-fir tussock moth prefers Douglas-fir and white fir in California, but will attack other firs ... |
|
Flatheaded Fir Borer
Melanophila drummondi |
"Flatheaded fir borers commonly breed in felled trees or those weakened by fire, defoliation, drought, or... |
|
Spruce spider mite
Oligonychus ununguis |
The spruce spider mite feeds on foliage. It is a common pest of ornamentals and thrives under hot, dry c... |
