can bring rivers and lakes to a standstill, destroying their ecology
and also the livelihoods of communities who depend on them. Two
of the most notorious are salvinia,
Salvinia molesta, and water
hyacinth, Eichhornia crassipes.
They have an
incredible ability to spread. Salvinia can double its size every
2-3 days and mechanical harvesting and herbicidal control can be
too slow to keep up. Neither is practical nor affordable in many
wetland situations. Environmental sensitivities often prevent the
use of herbicides.
of biological control has been spectacular. In many countries, water
ways that were once unusable are now returned to full use and the
agents have reduced the weeds to relatively insignificant populations.
developed has been passed on through collaborative research and
technology transfer projects with organisations in Australia, Asia,
the Pacific, Africa and the Americas.
results are long-term, sustainable (require little or no additional
inputs), environmentally friendly (non-polluting) and affordable
(repeat application is not required).