Stem rust in orchard grass hay
How bad is this for horse hay ? In the field it seems to be on about may 10 percent of all the plants or less . Thank you very much Tony
Washington County Oregon pastures and forages
In years past I have not been able to determine any toxicity of the rust for livestock. The biggest concern is respiratory issues. Once the hay is cut and dried, the rust becomes "dusty" in the hay and the severity of it depends on how much of the leaf and stem is covered and what percent of plants are affected.
I have recommended that severe rust infected hay not be fed to horses. It should also be fed outside in open bunks and not in stalls or enclosed buildings.
See my web page on hay for a little more information