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. > > > > > > > >_______________________________________________ > >pbs mailing list > >pbs@lists.ibiblio.org > >http://www.pacificbulbsociety.org/list.php > > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://www.pacificbulbsociety.org/list.php