Hello Michael,

You are correct, your maple tree has a condition called chlorosis. Chlorosis is a yellowing of the leaf, with darker green veins. It is frequently associated with nutrient deficiencies, particularly manganese and/or iron and is usually associated with soil pH. As soil pH increases, the ability of the tree to take up manganese decreases. Read more about Chlorosis in Red Maples here: https://www.canr.msu.edu/news/it_isnt_fall_yet_so_why_are_my_trees_leaves_yellow

If you have not done one, a soil analysis would show whether the soil that the tree is planted in is deficient in manganese and how you can correct it. To obtain a kit, go to: https://homesoiltest.msu.edu/get-started.

MSU Extension’s Plant and Pest Diagnostic Lab can analysis which nutrient is missing and how to manage it. Go to: https://www.canr.msu.edu/pestid/ to learn how to submit pictures and samples.

A certified arborist will be able to assess the tree. To find an arborist in your area, go to www.treesaregood.org, the website of the International Society of Arboriculture.

Thank you for contacting Ask Extension.