Is this little thing really what's destroyed my gardens?

[dice]

[aminopyralid in manures]

Here in the US we routinely need to do bioassays for broadleaf
herbicide contamination in manures:
http://whatcom.wsu.edu/ag/aminopyralid/bioassay.html

To avoid this:
http://whatcom.wsu.edu/ag/aminopyralid/

Testing with peas or beans is a better idea than testing
with tomato seedlings (shows contamination faster):
http://www.tomatoville.com/showthread.php?t=27485