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Insects Battle Invasive Australian Tree in Florida
20 Aug
Summary
- Insects from Australia combat invasive paperbark trees in Florida.
- Biological control agents target tree's growth and reproduction.
- Integrated management combines insects with mechanical removal.
Australian paperbark trees, or Melaleuca quinquenervia, became a significant invasive species in Florida's wetlands, infesting nearly half a million acres by the mid-1990s. To combat this, agencies turned to biological control, releasing insects native to the paperbark's homeland. The first insect, the melaleuca leaf weevil, was introduced in 1997 after extensive testing to ensure it posed no threat to native plants.
Subsequent biological control agents, including a sap-feeding psyllid released in 2002 and a gall-forming midge, were also introduced. These insects work by attacking different parts of the paperbark tree, reducing its growth and reproductive capacity. The weevil, for instance, caused up to a 90 percent reduction in flowering on attacked trees by 2004.
This biological approach is not a standalone solution. It forms a crucial component of an integrated management strategy that also includes mechanical cutting, herbicide treatment, and prescribed fires. By 2004, this combined effort had cleared almost 100,000 acres of melaleuca from public natural areas, significantly weakening the tree's dominance and making containment more feasible.
