This crabapple usually has bigger, red leaves (per owner) and this year, leaves are smaller and canopy is sparse with some die back. Overall, the leaves just look smaller, didn’t see any evidence of insects. Bark is also peeling. Owner says any lawn treatments done in the area are granules, not sprays.
Apple tree (owner said it is some type of apple, produces flowers but never apples), also is looking more sparse this year. Close up of the branch and leaves is from this tree. Owner applied fertilizer spikes around this tree about a week or two ago, but it was looking like this before that.
I was guessing winter and environmental stress from the weather this year, but any other suggestions for the owners?