Thanks for the question.

Sorry to hear about your cherry tree. We have been getting several reports this season (2024) regarding the high incidence of brown rot among stone crop fruit. I suspect this is attributable to a very wet June followed by recent warm weather in July. Treating brown rot on cherry trees involves a combination of cultural practices, chemical treatments, and ongoing maintenance. Here are some suggestions dealing with both your current situation and moving forward in a proactive manner:

1). Repeated and regular pruning is necessary in which infected twigs, branches, and fruit (mummies) are removed. This should be done to improve air circulation and sunlight penetration for the tree.  It appears that this is now part of your normal routine.

2). Whenever the need arises, but especially in the fall, clean up fallen leaves, fruit, and debris around the base of the tree. Dispose of this material away from the garden to prevent the spread of the fungus.

3). To the extent possible, water only at the base of the tree rather than overhead to keep the foliage dry.

4). Fungicides can be effective. In using them, read their label regarding use around products intended for human consumption. Apply fungicides intended for use against brown rot on cherry trees. Look for products containing myclobutanil, captan, and thiophanate-methyl.

5). Start fungicide treatments early in the season, especially during wet and humid conditions that favor fungal growth. Repeat applications as necessary, particularly during wet weather.

Here is some additional information on these and related points:

https://extension.umn.edu/plant-diseases/brown-rot-stone-fruit - :~:text=Brown rot is caused by,trees or on the ground.

https://www.apsnet.org/edcenter/disandpath/fungalasco/pdlessons/Pages/BrownRotStoneFruits.aspx

https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/insects-pests-and-problems/diseases/fruit-spots/brown-rot-of-stone-fruits

Good luck going into 2025. Hopefully things will be better. Thanks for using our forum.