Hi Warren,
Have a look at this link...might be of some use...looks like pretty tough stuff to be honest. It looks as though Glyphosate, Amitrol, Dalapon, and Paraquat have been relatively successful....however not too sure what their effect will be on the dicotyledons...sorry i can not be more help.
Non-native Invasive Freshwater Plants - Reed Canarygrass (Phalaris arundinacea) - Technical Information
---------- Post added at 02:51 AM ---------- Previous post was at 02:47 AM ----------
Warren...also dug this out of my archives.....might help you out.....
http://www.invasive.org/gist/moredocs/phaaru01.pdf
RCG can be successfully controlled by the proper use of herbicide. Small stands or clumps of RCG
can be effectively killed with one application, but large infestations will likely require several applications
over several years to be effective. Since RCG frequently grows in wet areas, only aquaticapproved
herbicides are allowed in many situations. As with all herbicide use, be sure to read and
follow all label instructions and to abide by all state regulations. Glyphosate (Rodeo(r),
Aquamaster(r), or Glypro(r) among others) applied in a 2% solution (1.08% active ingredient (a.i.))
with a nonionic surfactant works well to kill RCG. Glyphosate is a non-selective herbicide that kills
or injures nearly all plant species. Glyphosate is also available in many other formulations (e.g.
RoundUp(r)). These work well to kill RCG, but are not labeled for aquatic use, so be aware of the
areas where you plan on applying herbicide. Sethoxydim (Vantage(r)) is a grass-specific herbicide
that has been used to kill RCG with some success in the PNW, but it is also not labeled for aquatic
use.
Always follow all herbicide label instructions and directions! Non-target organisms that come in
contact with the herbicide may be injured or killed. If you have questions about herbicide choice or
whether your use is legal, please contact your state Department of Agriculture or local extension
agent.
Depending on the size and distribution of your infestation, the herbicide can be foliar-applied using a
dripless wick applicator, backpack sprayer, or boom sprayer (please visit
http://tncweeds.ucdavis.edu
for a full discussion of herbicide application tools). Herbicide should be applied to foliage during the
growing season. Application in the PNW can occur in mid-summer (just prior to summertime dormancy)
or preferably in late fall (just prior to frost and wintertime dieback). It is recommended to
apply herbicide at these times, since it is speculated that these are the times of year when RCG is
most actively translocating carbohydrates (along with the herbicide) down into the root system.
You may also combine an herbicide treatment with another control treatment for good results. First,
eliminate the aboveground dead litter by mowing or burning, then allow the RCG stems and leaves to
7
regrow to boot height. This helps obtain better herbicide coverage and reduce total herbicide use,
since you are spraying only living green RCG that is 12" tall vs. 6' tall stems mixed with old dead
leaves. Follow-up monitoring and treatment is necessary for several years to ensure complete kill.
RCG
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