Urban Forest Ecosystems Institute

DISEASE AND PEST LIST FOR:

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.

Disease or Pest Name	Description of Disease or Pest
Annosus root disease Heterobasidion annosum	Symptoms of Annosus root disease include fading of crowns to light green, thinning crowns, chlorotic foli...
Leaf Spot Pseudomonas lauraceum	This bacteria causes small angular, black lesions on the leaves.
Oak root fungus Armillaria mellea	Armillaria cases reduced terminal growth and general decline in affected plants, As the Armillaria advanc...
Phytophthora Root and Crown Rot Phytophthora cactorum	This disease, as its name implies, is characterized by red-brown exudate oozing from bark fissures in can...
Sudden Oak Death Phytophthora ramorum	Phytophthora ramorum causes two types of symptoms on affected plants. In some it causes bleeding cankers...
Tar Spot Rhytisma punctatum	Tar spot on maples is recognized by oval or irregular, glossy black tarlike raised spots on the upper sur...
White mottled rot Ganoderma applanatum	White mottle rot fruiting bodies are perennial, leathery to woody, flat or plate-like. The upper surface...