Professor warfaa reveals that despite his report to then govt on the risks posed by these plants and the govts decision to send them back they have been distributed quickly across the country!!
http://en.wikipedia.org/wiki/Ahmed_Mumin_Warfa

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Prosopis juliflora has become an invasive weed in several countries where it was introduced. It is considered a noxious invader in Ethiopia, in Hawaii, in Sri Lanka, Jamaica, the Middle East,[7] India, Nigeria, Sudan, Somalia, Senegal and southern Africa. It is also a major weed in the southwestern United States. It is hard and expensive to remove as the plant can regenerate from the roots.[8]
In Australia, mesquite has colonized more than 800,000 hectares of arable land, having severe economic and environmental impacts. With its thorns and many low branches it forms impenetrable thickets which prevent cattle from accessing watering holes, etc. It also takes over pastoral grasslands and uses scarce water. Livestock which consume excessive amounts of seed pods are poisoned. It causes land erosion due to the loss of the grasslands that are habitats for native plants and animals. It also provides shelter for feral animals such as pigs and cats.[8]
In the Afar Region in Ethiopia, where the mesquite was introduced in the late 1970s and early 1980s, its aggressive growth leads to a monoculture, denying native plants water and sunlight, and not providing food for native animals and cattle. The Regional government with the non-governmental organisation FARM-Africa are looking for ways to commercialize the tree's wood, but pastoralists who call it the "Devil Tree" insist that P. juliflora be eradicated.[9]
In Sri Lanka this mesquite was planted in the 1950s near Hambantota as a shade and erosion control tree. It then invaded the grass lands in and around Hambantota and the Bundala National Park, causing similar problems as in Australia and Ethiopia.[3]
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