I know this is an old thread, but I found on another forum someone had posted the copy from the label:

"... Not for use on plants being grown for sale or other commercial use, or for commercial seed production, or for research purposes. For use on plants intended for aesthetic purposes of climatic modification and being grown for interior landscapes, ornamental gardens or parks, and being grown in interior landscapes or on lawns and grounds. Do not use on plants that are to be used for food or feed.

Also, a poster on that forum had talked via telephone to a representative from the company who said that the EPA requires this wording so that large, commercial operations do not start dumping huge amounts of this stuff into the environment.