I imagine that's frustrating. Ugh. I'm not familiar with fungus on trees at all so I thought I'd look copper fungicide. It certainly brought up a lot of products...lol. But then I came across this which was what more what I was looking for to explain how it works. I thought I'd post a link as well since it explains a hazard of it as well, although the master gardener probably explained this to you. I thought perhaps other would find this interesting.
https://extension.udel.edu/weeklycropupdate/?p=5884
Of course I wasn't completely certain what 1/4 leaf break was so I thought I'd oogle the google. The first thing that I learned is that it is an anomaly in coins...

And that people have tree tattoos on their backs...both of which I didn't know.
However, being more specific in the search bar didn't really bring up any simple answers or results to explain exactly what 1/4 leaf break is. Is that when 1/4 of the new leaves are out? Am I anywhere close? Lol!!