"RichToyBox" wrote:

The following site says that roundup can be used to control the poison ivy.
http://www.conservation.state.mo.us/...e/flora/poivy/

Roundup does work on poison ivy. I have been using it for many years.
You need to use a strong mixture and add a spreader/sticker and may need
to reapply. Roundup works best on mature plants that are sending sap to
the roots, since it works by killing the roots. On very tall vines of
poison ivy, cut the ivy off about chest high and spray the lower part.
Poison ivy spreads by the rhizomatous roots and the seeds which birds
spread in their guano.

The botanist for the National Botanical Gardens in Washington DC said at a
meeting several years ago, that Roundup can be used to control weeds in
natural ponds without affecting the fish and other animals. It is
apparently neutralized on contact with water.

It is not neutralized on contact with water since it is an aqueous
solution. It is neutralized with water which contains clay particles.
It is the clay that neutralizes it. It is best to apply with a brush or
a cotton glove over a plastic glove so there is not over-spray that gets
into the pond or hits plants you don't want to kill.
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