Red cluster weed in new horse pasture
This looks like a sumac plant to me but I am not a weed expert. Check out the following: http://www.weedinfo.ca/en/weed-index/view/id/RHUTY
If it is sumac, it shouldn't be an issue from a toxicity standpoint as long as there is good forage for the horse to eat. sumac isn't poisnonous but if there may be a chance of irratiation to the mouth if the horse tries to eat it. I don't believe it is palatable at all to horses so as long as the horses have access to good forage they should be fine.
I would like to check with
Dierberger, BetsySoil Conservation Grassland Specialist at USDA-ARSGregory, Michigan
too give this weed an ID.
Fax: 517-324- 5171