Hi Grace,

I can't figure out wha the problem is. Maybe Anthracnose ?

https://extension.umn.edu/plant-diseases/anthracnose-trees-and-shrubs#:~:text=Anthracnose%20is%20a%20common%20fungal,require%20treatment%20in%20most%20cases.

It also looks like it could be the result of some bug sucking on the leaves ....

https://extension.okstate.edu/fact-sheets/anthracnose-and-other-common-leaf-diseases-of-deciduous-shade-trees.html

https://extension.umn.edu/plant-diseases/leaf-spot-diseases-trees-and-shrubs

I think it's something fungal but I sure can't identify it. I think you ned an arborist because it looks quite bad. I'm sorry I can't be of more help,

Sally Granath

St. Louis County MG

^{Hi Grace,}

^{It's definitely not definitely not Apple Scab.}

^{I think I may have figured it out, botrytis blight;}

^{https://plantpathology.ca.uky.edu/files/ppfs-gen-19.pdf}

^{I know I have seen leaves like this before.} 

^{https://ipm.ucanr.edu/PMG/GARDEN/PLANTS/DISEASES/botrytis.html#:~:text=Infection%20by%20Botrytis%20and%20Botryotinia,buds%20can%20fail%20to%20open.}

^{Do you think this might fit ? The weather has been very conducive for it.}

Hi Grace, here is what I found;

https://www.canr.msu.edu/news/recommendations-for-botrytis-fungicides

Sally