Black spots on Burgandy Belle Maple

Asked July 1, 2019, 12:50 PM EDT

Recently planted some Burgandy Belle Maples. Have sprayed for caterpillars and now many of the leaves have multiple black spots on the leaves. These are very small maples and I fear that this is going to destroy the trees. Please advise any treatment to save my trees.

Iosco County Michigan

1 Response

It appears that your maple leaves are infected with a very (very) common fungal disease called Tar Spot.
  • Description: Tar spot is an ugly but mostly harmless disease that strikes several maple species. As its name implies, tar spot disease looks like big black tar spots on the top of the leaves.
  • How it spreads: Infection typically begins in early spring and continues into the early summer. The fungus is able to take hold when there are prolonged periods of wet weather that prevent the leaves from drying off. Leaf spots start out yellow and evolve into a dark, tar color.
  • Prevention: Treatment is generally not recommended for tar spot because it is usually not a serious problem; however, raking up fallen leaves will keep tar spot at bay.
The information in the link below will provide additional information.