| Don't know anything about the Cassava tree poison...but if you are just looking to prevent soil erosion plant eucalyptus trees, they have a top root that holds the dirt on top and a deep root that will stabalize hill movement..create a well or dam around the planting area so that each tree gets lots of water in the early stages..after rooted the tree will help prevent erosion and slippage and if you need firewood there is nothing better than the eucalyptus.take care of the tree for three years and it will look after you for thirty my old father used to tell me |