Invasive alien species (IAS) are now considered to be one of the most serious challenges worldwide to mankind, biodiversity and the environment in the 21st century. Hazardous IAS have caused significant ecological disasters and vast economic losses in various ecosystems; agriculture, forestry, grasslands, islands, fisheries, natural marine and terrestrial conservation areas. Their immense threats are still continuing at alarming rates. The introduction and spread of invasive species are a worldwide problem that is increasing in frequency with escalating global trade, transportation, international travel and eco-tourism. The socioeconomic and ecological damage to the global environment caused by IAS have been conservatively estimated to exceed US$ 1.4 trillion an  >>