The newest update on how to stem poisoning old wilding pines in the Sounds!!

Nick Ledgard and Dave Henley of Scion, recently assessed a wilding stem poisoning trial on the Arapawa Island property of Alistair and Jenny Malcolm.  The trial was established on behalf of the South Island Wilding Conifer Management Group.  After 14 months, most trees were dead, with the hardest to kill being the lone outliers with large green crowns and branches.  Metsulfuron appears to be a much more cost-effective chemical than glyphosate.  A ‘one-for-all-sizes’ recipe is now being tested – essential for operators spending long days targeting lone trees up steep hillsides.  Interestingly, good results were also obtained using solid granules (no liquid).  Although more expensive, this could be attractive to those not wanting to carry heavy loads, or to face the problem of disposal of unused chemical brews at the day’s end.  While the poisoning team tackled the trees, Thomas Paul of Scion, established plots to monitor the vegetation successions promoted by the demise of the wildings.

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Thomas Paul, Dave Henley (Scion) and Alistair Malcolm (landowner) establishing vegetation monitoring plots under stem-poisoned radiata pine wildings in the Sounds.