Video from the Journal de FR2 of September 19, 2006 about the recent (Franco-French) ban on selling (but also on transmitting knowledge and information) of phytosanitary products that have not been authorized.

Prohibition of natural products in agriculture by econology

More:
The recipe for nettle manure and its possible uses.
Debate on the ban and approval of plant protection products on forums
Nettle manure re-authorized for marketing in 2011?
Linked topic: towards a European ban on phytosan plant-derived medicinal products? Via the Traditional Herbal Medicinal Products Directive (THMPD)

Download file (a newsletter subscription may be required): Ban on nettle manure in France2