Anthracnose is a group of diseases resulting from infection by several fungi that effect deciduous and evergreen trees/shrubs
Apiognomonia errabunda, A. veneta, Discula fraxinea, Glomerella sp., Gnomonia sp., and Stegophora ulmea
Maple, ash, oak, sycamore, dogwood
Threat to Trees
Moderate to Severe
Seasonally in wet conditions, requires repeated seasonal disease before mortality
Spores released and travel in wind and rain from higher crown to younger shoots
Signs & Symptoms
Elm and Oak trees will display small tan, brown or black spots on leaves. Sycamore trees develop lesions along major leaf veins. Young leaves become curled and distorted. Mature leaves resist infection but occasionally display spotted lesions. Heavily infected leaves fall prematurely.
Cankers can also be a symptom of Anthracnose, causing dieback or girdling.
Attacks developing shoots and expanding leaves, manifested in varying forms. Primarily effects leaves and twigs. Fungus usually occurs during rainy season, but on some evergreens can last year round. Requires water to disseminate and infect, unsuccessful in drought or dry conditions.