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| Anthracnose of shade trees | ||||
| IPM scouting in woody landscape plants > anthracnose of shade trees | ||||
| Cause: Anthracnose refers to a symptom rather than a specific fungus. Hosts: Different fungi produce anthracnose on specific host plants, as shown in the table on pages 86-87. Many plant diseases and weather stress cause similar symptoms. Don’t rely on symptoms alone. Confirm your diagnosis at by sending a sample to MSU Diagnostic Services, where microscopic identification of spores is used for a positive I.D. Symptoms: In general, anthracnose symptoms are worse after cool, wet springs. Spores have an extended opportunity to wash from branch and twig cankers to new leaves and shoots. Sycamore anthracnose: Sycamore leaves with anthracnose develop brown lesions that begin along the leaf veins. Lesions enlarge and coalesce as infection progresses. Witches’ brooms develop after repeated infection and dieback of twigs. Cankers may develop on twigs.The amount of defoliation depends on the severity of the infection. Anthracnose symptoms on white oak in spring: Anthracnose on oak usually occurs in the lower crown. Compare with oak wilt: The early symptoms of oak wilt may appear similar, but appear in July and begin in the upper part of the tree. Management: Sanitation is important in managing anthracnose. Rake up and destroy fallen leaves to reduce source of inoculum. Remove diseased and dead wood and prune trees to improve air drainage. Fungicides are usually not needed, but fertilization may help trees that are heavily defoliated. |
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Anthracnose diseases of shade trees |
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| This information was developed from A Pocket IPM Scouting Guide for Woody Landscape Plants by Diane Brown-Rytlewski. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2839). |
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