VARIEGATED MAPLE TREE LEAF BLOTCHES

Asked June 12, 2017, 8:17 PM EDT

Hi. We planted this maple tree about 15 years ago. It used to be variegated but as you can see, very little remains. Last year some leaves started developing brown spots. This year, it continues. I'd like to know what is causing this and if there is something we should be doing. We have 2 other variety maples next to it and they seem fine. Thank you for your help.

Chisago County Minnesota diagnosis of plant problems brown leaves maple tree horticulture

1 Response

Many of the leaves shown in the photo appear to have been affected by a fungal disease called anthracnose. Variants of this fungus affect the leaves of many trees and other plants, especially in spring.

Go here to learn more abut anthracnose:
https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/anthracnose/

Plants with variegated leaves sometimes revert to their original non-variegated form. When this happens, the usual remedy is to remove branches with non-variegated leaves as soon as they appear. Otherwise, the stems with non-variegated leaves which are usually more vigorous, will eventually dominate and the reversion will be complete and irreversible.

Learn more here:
http://msue.anr.msu.edu/news/understanding_tree_reversions