Re: CULT: Herbicide - Stinger persistence etc

To satisfy my own curiosity - what I learned on the web - combination of
stuff from several university & gov sites..

Clopyralid is the common name of a herbicide that kills a "narrow range"
of broad-leaved weeds such as dandelions, clover, and thistle. It does
kill broad-leaved weeds, but isn't a broad spectrum herbicide (I think
that's what Dave meant).  It has been registered for use on turf, field
corn, grass hay, and some other crops, ... is... used on lawns.
....Products .... that contain clopyralid ... Confront, Curtail,
Millennium, Redeem, and  <Stinger>. ....

Baby weeds die fast, but it may take a whole season to kill established
perennial weeds.  It is primarily effective against four plant families
(they don't quite know why just these four): Asteraceae (sunflower
family, including dandelion & prickly lettuce); Solanaceae
(nightshade/tomato family); Fabaceae (legumes/peas/clover family); and
the Polygonaceae (buckwheat/knotweed family).

Clopyralid, and the similar herbicides picloram and triclopyr, have long
lasting effects against target weeds when applied at low rates. They
also have low toxicity to humans and animals.

Certain herbicides such as clopyralid, picloram and triclopyr are quite
persistent in the environment.  The good news is that it breaks down
completely, so doesn't lead to accumulation of more persistant break
down products.  Breaks down fastest in warm, moist soils low in organic
matter, slowest in soggy, cold, dry or compacted soil.

In 1999, [commercial?] composters in Washington State discovered that
clopyralid was surviving the compost process, and injuring plants where
the compost was used.

--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
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online R&I <http://www.irisregister.com>

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