Plantmark,
Sorry to learn of your experience, its worrying at a number of levels. I believe that its actually advised that crop residue treated with this compound, should not leave the field.
Dow are aware of the issue, see their information site at :
http://www.manurematters.co.uk/home.htm
Unfortunately there are no ‘approved standards’ for the manure supplied; although your suppliers’ forage should have.
Having seen the “greenwaste” bin at the local amenity site, and the dubious material it contains, I am fearful of this material also, especially in the light of lawn weedkiller .
