Border Privet: Forest Invader!
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Border Privet: Forest Invader!



Presentation on the invasive border privet.

Presentation on the invasive border privet.



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Border Privet: Forest Invader! Border Privet: Forest Invader! Presentation Transcript

  • Border Privet- Ligustrum obtusifolium Forest invader!
  • Privet may persist, long-term, in fields whereit grew under trees that have been removed.
  • Privet: How it starts.Above: First yearRight: Second year(Flowering occurs third year or later.)
  • Adolescent privet, eager to flower!
  • Privet in flower – The fragrancedelights some, distresses others. Thanks, Google images!
  • Privet has opposite leaves and oppositebranching (and may be evolving thorns).Herbicided young privet Dormant mature privet
  • A variety of pollinators love privet!
  • Birds very effectively disperse privet seeds. An American robin repeatedly flies up toBorder privet berries in early December, grab mouthfuls of Japanese privet berries,Shaw Nature Reserve. Fruiting twiglets as in this picture from North Carolinalater fall to leave thorn-like growths.
  • So, how do we kill privet?• Prescribed burning (+ or -)• Cut stump and basal treatments (mostly -)• Aerial spraying (+ or -)• Individual foliar treatment (mostly +)
  • Prescribed burningPro:-- Fire top-kills privet,weakening it, and preventingflowering/fruiting for 2-4 years.-- Fire may stimulate nextseason’s growth andreproduction of natives.Con:-- Fire does not kill privet.-- Fire creates bare ground onwhich newly dispersed privetseeds may germinate.Note: Mowing/brush-hoggingeffects roughly comparable inefficacy.
  • Cut stump and basal treatmentsPro:-- Cutting mature plants nearthe base top-kills privet,weakening it, and preventingflowering/fruiting for 2-4 years.-- This can favor next season’sgrowth and reproduction ofnatives.Con:-- Dormant season cut-stumpherbiciding does not kill privet,even with picloram-2,4,D!!!-- It may work during growingseason (not tried), but this canharm other growing plants.
  • Aerial sprayingPro:-- Can treat a large, heavily-infested area efficiently.-- Depending on timing, possiblyselective for killing younger plants,which retain foliage longer.Con:-- Weather, season restrictions.-- Depending on timing, possiblyselective for killing younger plants,which retain foliage longer.-- If co-ocurring with Amurhoneysuckle, timing is tricky,because they retain foliage longer.-- Kills other plants green at the Sprayed 15 Nov. 2011same time, e.g. sedges, phlox. Photo: 18 Apr. 2012 (Died soon after.)
  • Individual foliar treatmentPro:-- With care, can be targeted specifically,good for spotty or sparse infestations.-- Kills any-age privet plant that isproperly treated.-- Can be opportunistically directed atother invasive plants that co-occur.-- Good job for dependable,knowledgeable volunteers.-- Results visible in a few days.-- Some formulations highly effective!Con:-- Weather restrictions (rain, too cold, toohot).-- Labor-intensive and uncomfortable.-- Kills other green plants that receivespray drift. Google images “backpack sprayer”
  • Save the world: Trim your hedges But the privet can get the better of you, so maybe better simply not to plant it. reproduce.html
  • Seriously, though . . .• Hand pulling or using a brush-wrench are effective but labor-intensive, and hard on the back.• Prescribed fire or brush-hogging on a 2-3 year interval will control flowering/fruiting. Hot fire may kill seedlings and very small saplings outright.• The only thing that seems effectively to kill privet is growing-season foliar herbicide treatments. – Backpack spraying, 4-5% glyphosate – Backpack spraying, 2% glyphosate + 0.5% triclopyr – Aerial spraying, large droplets, 12% glyphosate + appropriate surfactant (about 0.75 gallons of concentrate/acre)
  • Goats, anyone?