Brooklyn1 wrote:
"David E. Ross" wrote:

If you really want to kill the ivy, apply Roundup to the foliage
with a sponge or brush, which will avoid damaging the tree on which
it is growing.

That's much too risky. The ivy will quickly draw the Roundup deep
into it's roots where it will be deposited in close proximity to the
tree roots, whereby it will severely damage if not kill the tree.

How do you know this? When a plant is growing strongly roundup is drawn
down into the plant after it is applied to from the leaves, this is
docmentated as part of the way it works and the reason using it on dormant
plants is largely a waste of time . Where did you get the bit about it
crossing from the ivy roots to the tree roots via the soil?

David