ForesTree - A Guide to Tree Health

Pest and Disease Information

Monterey Pine
  • Pinus radiata - Resistant to Oak Root Fungus, Texas Root Rot and Verticillium. Susceptible to Aphids, Beetle Borers, California Five Spined Engraver Beetle, IPS, Spruce Spider Mite and California Flathead Borerand Scales, Oak Root Rot, Leaf Blight, Phytophthora, Root Rot, Black Stain, Mistletoe, Western Gall Rust and Pitch Canker. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (1071) | Silvics of North America
15 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...

Coastal Dwarf Mistletoe
Arceuthobium littorum

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

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...

Phytophthora root disease
Phytophthora cinnamomi

Phytophthora_cinnamomiP. cinnamomi causes a general plant decline. Plants can be killed quickly causing them to retain dead leaves for a long period. Plant symptoms include leaf and twig dieback, bleeding through bark cracks,...

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...

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 ...

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 ...

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 ...

Spruce spider mite
Oligonychus ununguis

Oligonychus_ununguisThe spruce spider mite feeds on foliage. It is a common pest of ornamentals and thrives under hot, dry conditions. The adults are green, pink, or brown and occur mostly on older needles. Needles first a...