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Melaleuca quinquenervia
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IPRL results from Melaleuca quinquenervia from three biological control insects.


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A foliage-feeding weevil released in 1997


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A gall forming midge released in 2008

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A sap-feeding psyllid released in 2002


Attack by these agents has had the following impacts on Melaleuca quinquenervia:

  • Up to 99% reduction in seed production.
  • Greater than 85% reduction in the number of seed bearing trees.
  • Tree biomass reduced by up to 77%.
  • Field populations have become up to 84% less dense.
  • Plant growth rate reduced by 50%.
  • Trees are now 36.5% more susceptible to fire.
  • Trees are now 30-40% more susceptible to herbicides.
  • Native plant diversity has increased by up to four fold.

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No biological Control

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Biological control present