ForesTree - A Guide to Tree Health

Pest and Disease Information

Bigleaf Maple
  • Acer macrophyllum - Resistant to Oak Root Fungus. Susceptible to Beetle Borers, California Flathead Borer and Caterpillars, Sudden Oak Death, Root Rot, Oak Root Rot, Annosus Root Disease, White Mottled Rot, Leaf Spot and Verticillium. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (58) | Silvics of North America
7 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...

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...

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 ...

Tar Spot
Rhytisma punctatum

Rhytisma_punctatumTar spot on maples is recognized by oval or irregular, glossy black tarlike raised spots on the upper surface of the leaves.

White mottled rot
Ganoderma applanatum

Ganoderma_applanatumWhite mottle rot fruiting bodies are perennial, leathery to woody, flat or plate-like. The upper surface is light brown and often covered with brown spores. The lower surface is white turning brown when ...