[pbs] Fertiliser-mushroom compost

gardenpt at aol.com gardenpt at aol.com
Mon Mar 30 22:32:11 EDT 2009


The active ingredient of that herbicide is clopyralid. It has since 
been removed from retail sales but is still used by landscape 
professionals and farmers.

The advice is that if one wants to use clopyralid contaminated organic 
matter, that it be composted for a year.

That particular information was always on the label but some folks 
ignored it, to the dismay of many. You can find info about it from 
Washington State University.
See http://www.puyallup.wsu.edu/soilmgmt/Clopyralid.htm.

Jean in Portland, OR



.... Most are destroyed by proper composting, but
there have been reports of high levels of both larvacides and one 
particular
type of herbicide (name escapes me at this time) in composted horse 
manure. ...




-----Original Message-----
From: Mark Mazer <markmazerandfm13 at earthlink.net>
To: Pacific Bulb Society <pbs at lists.ibiblio.org>
Sent: Sun, 29 Mar 2009 2:43 pm
Subject: Re: [pbs] Fertiliser-mushroom compost



>I've read the best place to get your horse manure is at a race stable.
>The thoroughbreds eat like the rich and famous so it makes sense that
>what comes out the back end is equally rich.


You are going to want to be careful using horse manure as it can have 
larvicides
and other pharmaceutical's in it. Most are destroyed by proper 
composting, but
there have been reports of high levels of both larvacides and one 
particular
type of herbicide (name escapes me at this time) in composted horse 
manure. I
never use the stuff on my edibles anymore.

I'm using small amounts of poultry litter from the farm next door. It 
is tested
yearly for the row crop farmers that use it on the fields.


Mark Mazer
Hertford, North Carolina USA
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