Sirex noctilio (Sirex wood wasp)
Origin: Europe and Asia
Threat: This insects associate with a phytotoxic, wood rotting fungus Amylostereum areolatum, which female wasps inject to the pine tree at the time of oviposition. The fungus and the mucus injected by the wasp weaken and kill host trees. The trunk of attacked pine have characteristic resin beads, then foliage wilts, turns yellow and the brown.
Occurs in: Pine spp., Picea spp. Abies spp., Larix spp., Psuedotsuga menziesii (Douglas fir)
Distribution: Australia, New Zealand
Imperata cylindrica (Alang alang)
Native: South east Asia
Threat: Abandoned shifting-cultivation areas are almost always invaded; one of the most noxious colonizers of the degraded humid tropical forest soils
Occurs in: Agricultural areas, coastland, natural forests, planted forests, range/grasslands
Distribution: Australia, Indonesia, USA