Oat millers in Canada are telling growers that a plant growth regulator isn't effective on oats, so farmers probably don't need to use it.

Farmers advised the juice may not be worth the squeeze on heels of contamination report
Environmental Working Group blames Canadian producers for residues of plant growth regulator found in oat products
Discovery sets off media story despite samples testing well inside safe levels
The list of products exporters don’t want farmers using on their crops is being revised
The product cannot be used on exports destined for the U.S. until maximum residue limits are established
Manipulator, a plant growth regulator recently registered for wheat in Canada, hasn’t been approved in the United States yet