ForesTree - A Guide to Tree Health

Pest and Disease Information

Knobcone Pine
  • Pinus attenuata - Resistant to Texas Root Rot and Verticillium. Susceptible to Aphids and Beetle Borers, Pitch Canker. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (1030) | Silvics of North America
KNOBCONE PINE
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...

Pitch Canker
Fusarium circinatum

radiataPitch canker causes cankers/necrotic areas of bark on the main stem and lateral branches of affected trees. Pitch may stream from cankers. The cankers cause top kill and branch dieback. Flagging of branch...

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...

Western Gall Rust
Endocronartium. harknessii

Endocronartium_harknessiiWestern gall rust forms globose to fusiform galls form on the branches or trunk of infected trees. On large trees this results in a hip-canker. The fungus produces powdery yellow-orange spores on surface ...

California fivespined engraver
Ips paraconfusus

ips_paraThe California fivespined ips kills saplings, pole sized trees, young trees up to 26 inches in diameter and the tops of even larger trees. It often breeds in slash and recently downed material and spreads...

California flatheaded borer
Melanophila californica

Melanophila_californicaThe California flatheaded attacks trees in rocky soil and fringe stands where soil moisture is limiting. It also attacks old and unhealthy trees. Healthy trees are not immune, but less susceptible. Adul...

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 ...

Ips
Ips spp.

Ips_spp_adultIps kills saplings, pole sized trees, young trees up to 26 inches in diameter and the tops of even larger trees. It often breeds in slash and recently downed material and spreads from there to live trees....

Irregular Pine Scale
Toumeyella pinicola

Toumeyella_piniThe irregular pine scale is the most damaging scale on pines in coastal California. Severely infested trees grow very little and young trees may be killed by repeated heavy infestations. The female over ...