Crab Apple leaf disease
let me preface this by saying that I'm in the process of adjusting a newly installed drip system and we had a solid week of rain about a week ago followed by a hot, sunny week and probably too much watering from my un-perfected drip system. My garden is on the roof in containers. A few have leaf problems.
this is my crab apple. I have two and they both seem to have it, one to a lesser degree than the other. This was not an overnight thing. It's been happening little by little although I believe I noticed it after moving them from the shade into a sunnier spot. I might have just noticed it more because of the sun.
anyway...I've sprayed with neem oil but it doesn't seem to help. One of them I practically defoliated. The leave came back fine but as they got larger they got the spots again.
Picture attached...thanks in advance for advice...