Do you think current fallen wild cherry leaves could cause respiratory...
Do you think current fallen wild cherry leaves could cause respiratory distress in a horse..rapid breathing flared nostrials
These are not fallen branches/wilted leaves just the fall leaves falling.
Muskingum County Ohio horses
Leaves that are green and wilting present the highest risk. The best answer I would be able to give in this scenario is to exercise caution and take a conservative approach to prevent access to wild cherry.
This is specific to beef cattle, but good discussion on understanding wild cherry and animals: http://u.osu.edu/beef/2010/06/09/summer-storms-and-wild-cherry-trees/
Also see: https://extension.psu.edu/cyanide-poisoning-of-livestock-from-cherry-tree-leaves and https://extension.psu.edu/plants-toxic-to-horses#section-12 as further sources discussing plants poisonous to horses.