ForesTree - A Guide to Tree Health

Pest and Disease Information

Ponderosa Pine
  • Pinus ponderosa - Resistant to Texas Root Rot and Verticillium. Susceptible to Aphids, California Five Spined Engraver Beetle, IPS, Red Turpentine Beetle, Western Pine Beetle, Western Pine Shoot Borer and Beetle Borers, Pitch Canker, Red Ring Rot, Pitted Sap Rot, Oak Root Rot, Mistletoe, Western Gall Rust, Mountain Pine Beetle and Black Stain. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (1068) | Silvics of North America
PONDEROSA PINE
18 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...

Black stain
Leptographium wageneri

Leptographium_wagneriDuring the early stages of black stain terminal growth is reduced and older needles become chlorotic. As the disease progresses older needles are shed prematurely, new needles are stunted and yellow, lat...

Dwarf Mistletoe
Arceuthobium campylopodum

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

Needle Cast
Elytroderma deformans

Elytroderma_deformansThis needle cast causes premature shedding of conifer needles and can cause witches' brooms. In severe infections it can lead to death, especially on Jeffrey Pine.

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...

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 ...

Black pineleaf scale
Nuculaspis californica

Nuculaspis_californicaOutbreaks of black pineleaf scale are often associated with smog and dust. The insect feeds only on the needles and is yellowish-brown to black and broadly oval in outline. The injured needles turn yello...

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 ...

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...

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....

Mountian Pine Beetle
Dendroctonus ponderosae

Dendroctonus_ponderosaeThe mountain pine beetle often kills trees in small groups. Many times these trees are weakened by fire, drought, dwarf mistletoe, rust, or smog. Generally only trees over 10 inches in diameter will be a...

Red turpentine beetle
Dendroctonus valens

Dendroctonus_valens_frassThe red turpentine beetle most often attacks trees are weakened by fire, drought, dwarf mistletoe, rust, or smog. It can attack freshly cut logs and stumps. Often attacks trees in campgrounds and around ...

Western pine beetle
Dendroctonus brevicomis

Dendroctonus_brevicomisThe western pine beetle often kills trees in small groups. Many times these trees are weakened by fire, drought, dwarf mistletoe, rust, or smog. Generally only trees over 6 inches in diameter will be att...

Western pineshoot borer
Eucosma sonomana

deadshootsThe western pineshoot borer is a significant pest on young open-grown pine. The adult is a coppery-red moth and lays its eggs on elongating shoots in the spring. The larvae bore through the terminal shoots...