In article ,
says...


The horse farm where I'm getting this from isn't a commercial venture,
they only have a couple of horses so I doubt they are using anything
exotic.

http://www.omafra.gov.on.ca/english/...s/aminopyr.htm

http://www.dowagro.com/uk/grass_bites/faq/

http://www.ruraltech.org/video/2006/...fs/NHS_Hall/21
_carrithers.pdf

http://www.the-compost-gardener.com/picloram.html

http://www.allotment.org.uk/garden-d...-contaminated-
manure/

http://www.manurematters.co.uk/equine_health.htm

http://www.manurematters.co.uk/aminopyralid.htm