Blasted Blight on our Beautiful Maples

maple anthracnose      Seeing dark spots and blighted tissue on our native maple leaves?

  Click HERE for the AUDIO version of this blog post.    

We are seeing leaf spot and leaf blight on several native species, including silver maple (Acer saccharinum), red maple (Acer rubrum), red x silver hybrids (Acer x freemanni) and sugar maples (Acer saccharum) and amur maple (Acer ginnala).

This is maple anthracnose and it is caused by several fungi including Aureobasidium apocryptum, Discula campestris (Gloeosporium), Discula umbrinella and Colletotrichum spp.  We have submitted multiple samples to the lab to determine which fungi are bothering our beloved maples.

IMG_1693                               The unusually cold spring prolonged leaf emergence and the near constant wet conditions were perfect for supporting several fungal and bacterial diseases on plants this year. Maple anthracnose (above photo: Melissa Huntley) has been detected all across Ontario and in several NE United States.  We can find it both in the landscape and in the nursery.

The second flush of leaves coming on should hide a lot of these symptomatic leaves.  There is no need for management of this disease as infected leaves are usually (mostly) retained on the tree.  Keep root system soils aerated and provide supplemental watering when conditions become more consistently hot and dry.

AcerPlatUpperDisculaCampestrisLateInfect_LHawkins_01

Click HERE for the AUDIO version of this blog post.    

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One Response to Blasted Blight on our Beautiful Maples

  1. Pingback: Black Spots and Blighted Leaves on Native Maples? Don’t Panic. - Toronto Master Gardeners

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