Asked May 15, 2021, 12:14 PM EDT
Anoka County Minnesota
Thank you for writing.
I cannot confirm your diagnosis.
Most apple trees are in full bloom now, making it too late to apply treatments. The treatment is also hard on pollinators and on the edibility of the fruit. This is a summary of the matter from our colleagues at Clemson University. https://hgic.clemson.edu/factsheet/cedar-apple-rust/