Anthracnose

Anthracnose is a group of diseases resulting from infection by several fungi that effect deciduous and evergreen trees/shrubs

Latin Name

Apiognomonia errabunda, A. veneta, Discula fraxinea, Glomerella sp., Gnomonia sp., and Stegophora ulmea

Trees Affected

Maple, ash, oak, sycamore, dogwood

Threat to Trees

Moderate to Severe

Onset

Seasonally in wet conditions, requires repeated seasonal disease before mortality

Transmission/Vector

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.

Description

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.

Domestic Origins

Unknown

Geographic Location

Unknown

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