ForesTree - A Guide to Tree Health

Pest and Disease Information

Tanoak
  • Notholithocarpus densiflorus - Susceptible to Scales, Sudden Oak Death, Oak Root Rot, Phytophthora, Root Rot and Rust. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (827) | Silvics of North America
TANOAK
6 Records Found
Disease or Pest NameDescription of Disease or Pest

Leaf Spot
Pseudomonas lauraceum

This bacteria causes small angular, black lesions on the leaves.

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 and Crown Rot
Phytophthora cactorum

phytophthora_cactorumThis disease, as its name implies, is characterized by red-brown exudate oozing from bark fissures in cankers on lower parts of the mainstem of the tree. Wood behind the wet areas is dead and stained reddi...

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,...

Sudden Oak Death
Phytophthora ramorum

AerialPhytophthora ramorum causes two types of symptoms on affected plants. In some it causes bleeding cankers on the mainstem with red-brown exudate. Zone lines are present around diseased tissue when bark is ...

California oakworm
Phryganidia californica

phryganidia_californicaCalifornia oakworm is an important defoliating pest of ornamental coast live oak. Most years it is of little concern, but some years the damage is extensive. California oakworm seldom kills trees, but it...