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G'day Dave,
Bad luck old son, you wont do that again for a while.
Anyway, I have been trying to kill of a rose bush that I can not dig out as
it is among the roots of an old Camellia. After 3 doses of double strength
glypho it is still arguing the toss. In your case I would just wait and see
what happens, hopeing for a spurt of growth to show its survival. Did you
rinse off the spray? Mine browned off at first but then re-shot. Good luck.

China
Wingham
NSW