Yes, there are. I'm involved in that, too; with my wheat, I have lots of wild-oat herbicides. I'm a corn producer, also.
When corn herbicides come for registration, they always get registered for the area of large acreage--Ontario, Quebec, eastern Canada. The label will read “eastern Canada only”.
Because corn is a minor crop in Manitoba--maybe 150,000 acres--the focus of the company is not to get registration for such a small number of acres. I have lots of wild-oat herbicide for my wheat, my cereal, but I lack the products or tools that eastern Canada has for corn. Any herbicides that we have for corn production in Manitoba have all come through the minor-use registration process. In respect to corn, it is the Manitoba Corn Growers Association that has to go out and pursue those registrations.