Tar Spot (Rhystima spp.), a common fungal pathogen that affects some maples, like Norway, Silver, and Red maples. This is an ornamental disease and will not kill the tree.
The thin bark of younger trees is easily damaged by lawn equipment or buck rub. Take care when mowing around the tree and apply a trunk guard over fall and winter to protect the trunk from mechanical damage.
Like other Freeman Maples, Autumn Blaze Maple may produce suckers on the trunk or at old pruning wounds. They should be removed only during the dormant season when they are observed. You can help prevent suckers by maintaining tree vigor.
Young trees can be susceptible to leafhopper and scale damage. If you observe your tree declining or individual branches dying off (known as ‘branch flagging’), consult an arborist to determine what plant health care options are best for your tree.
We’ve noticed that Autumn Blaze Maple tends to get frost cracks more often than other newer cultivars. If you’re planting in an exposed location, consider Celebration Maple, Sienna Glen Maple, or Autumn Fantasy Maple. Autumn Fantasy is the closes substitute in terms of branching and color.