Arum italicum

Peter Taggart
Wed, 23 Apr 2014 10:43:13 PDT
digging up the Arum is a good way to spread the plant.
It survives the glyphosate because the plant is either stressed as Tim
said, or the peripheral offset tubers are not in leaf and therefor remain
unaffected. Seeds in the soil may also germinate subsequent to treatment.
In my experience follow up applications in subsequent years are needed.
Small doses of glyphosate are not always enough to kill a plant but they
weaken it -reducing uptake from subsequent applications. Large doses on the
foliage burn the leaves and the plant survives as if it had received an
inadequate dose. Therefore I find it more effective to repeat application
of a weak dose two or three times in a two to three day period.

On 23 April 2014 17:39, Jane McGary <> wrote:If
there's that much arum in a wetland, it does need to come out. It will have
to be dug -- the tubers can survive herbicide application.

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