Equisetum control

John Bryan johnbryan@worldnet.att.net
Mon, 04 Aug 2003 15:22:58 PDT
Dear All:

I think paraquat is now banned. Cheers, John E. Bryan

"Roy M. Sachs" wrote:
> Thanks to Den, Jean and Lauw for advice.
> For those interested in herbicides as aids in the control of horsetails:
> a) Grammoxone is sold in the US as paraquat.
> b) The Oregon State web site refers to a Pacific Northwest weed
> control handbook because herbicide permits change frequently and I
> suspect that will be the case in CA.
> c) I did a web crawl on equisetum control and found most
> recommendations for Casoron  (dichlobenil is vulgar chemical name),
> Of course, the horsetail shoots are right in middle of clumps of good
> geophytes (common habit of all weeds, no?) so the herbicide will have
> to be painted on the slightly thrashed horsetail shoots.
> >Firstly, do not treat until the plant is fully grown in late summer because
> >you need as much growth as you can get to absorb the herbicide. Then thrash
> >(bruise) the stems and leaves with twigs (this breaks up the waxy surface).
> >Then mix a systemic herbicide with a mix of light cooking-oil and
> >white-spirit or turpentine (any light oil will do) until it is thin enough
> >to spray and use it in place of the recommended water quantity. Finally,
> >spray the mixture thoroughly over the whole plant. The oil/spirit mix will
> >ensure that the herbicide is in contact with the plant for a sufficient
> >period to kill it and it is rain-proof.
> >
> >There is also a giant, non-invasive form of this plant which looks
> >absolutely magnificent.
> >
> >Good luck.
> >
> >Den.
> >
> >
> >
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