The critical time for brown rot sprays as the fruit start to turn from green to straw color, to red.  Bees are generally not active in orchards then so fungicides should not be a problem to them.  You can spray in the early morning before bees are active on weeds under the trees.   Immunox fungicide is relatively safe as is captan.

Thank you. Unfortunately, pre-fruiting post blooming. All of my Bloom stems appear destroyed by fungus so there’s no waiting to spray. Maybe this is residual from last year?
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It would be very unusual for brown rot to nearly or completely wipe out your flowers during bloom.   My guess is that cold weather was the culprit.  Many fruit growing regions in Michigan have poor crops this year due to freeze events.

The following table shows critical temperatures for the various tree fruit at different growth stages.  

https://www.canr.msu.edu/fruit/uploads/files/PictureTableofFruitFreezeDamageThresholds.pdf

Thanks for the additional response. It’s still a puzzle to me because it wasn’t that cold and the neighbors cherries are fine.
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It could be blossom blight due to brown rot.
See this for pictures.
https://www.canr.msu.edu/ipm/diseases/brown_rot#gallery

There also was a fair amount of bacterial canker on cherries in the northwest lower peninsula this year.  Symptoms are a bit different.
https://www.canr.msu.edu/ipm/diseases/bacterial_canker_blossom_blast?language_id=

Without seeing pictures of your situation, it is hard to know.

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That's impressive.   Can you get some closeups?   Higher quality would be very helpful.  Try to zoom in on individual clusters, and also show some leaves, particularly if there is leaf spotting.  You may need to pick a few to take closeup pictures on a flat surface to help insure they are in focus.   Are the cherries the only thing showing damage like this?

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David,
Our Ask an Expert system does not allow videos to be sent to us.  You will need to send photos.  Sorry.

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Thanks for the pictures.   I think this is frost damage rather than brown rot or bacterial canker.  The reason being that there are viable fruit in some of the brown clusters.  Brown rot will ruin all the bloom in a cluster.  Second reason is that the damage is so widespread.  Brown rot is more sporadic than this.  The pictures were not detailed and close up to individual clusters for me to look for mycelia growth typical of brown rot.   

I don't see any leaf lesions typical of bacterial canker.   Another possibility is herbicide drift if you are near a field that was sprayed at about bloom time.   

I note that Chatham recorded 18 F on April 25.  This would be tough on flowers getting close to bloom.  You mentioned your neighbors cherries were okay.   Slight differences in locations, arrangement of trees, air flow, and different varieties tolerance can make a big difference in the impact of a cold spell.  Again, this is my best guess from afar.

Thanks