Crimson King maple tree

Asked August 29, 2020, 11:57 AM EDT

Why are Crimson King maple trees dying from some type of disease that’s even affecting their saplings in zone 5b?

Wayne County Michigan

1 Response

Hello. The small tree has tar spot and it is usually not treated. The black spots appear later in the summer but begin during early summer. When the leaves fall off it is best to rake them and put them in the trash since rain or irrigation on the fallen leaves can re-infect the tree. The severity of these spots can vary from year to year depending on the weather. The large tree might have verticillium wilt or suffering from lack of water, I cannot tell from your photo. Verticillium is a soil disease. If this is your tree you might want to consider a consultation with a certified tree arborist in your area. If it is verticillium and the tree is removed you will want to plant a resistant tree in that area since verticillium stays in the soil. An arborist can be found by going to the ISA website and following the prompts: