Lying between the Indian, Pacific and Southern Oceans, Australia's climate-in particular its rainfall-is difficult to predict reliably and accurately, driven as it is by the interplay of a complex set of systems

Weeds pose a significant threat to natural ecosystems in Australia and consequently large quantities of resources are spent each year to manage them.

Over the years a great deal of work has been directed towards improving the selection, testing and evaluation of biological control agents for weed control.

Landscapes and ecosystems are composed of complex networks of interactions; consequently the effects of management actions can be unpredictable.

This fact sheet summarises the work Dr John K.