This direction is most evil-during suns transits towards South (Dakshinayana) even Devas take rest.
This direction shows us our end-death period.
Since birth our travel is towards death- At the time of death our feet are kept towards south and during cremation also our feet are kept towards south.
Those who have fear death, should keep Big Trees or greenary towards southern portion of their house.
Lord of this direction is Yama-Planet is venus - which gives enjoyment and pleasures in life leads us towards death.
Venus is the king of Demons.
Other Lords of this direction are Usha Vitatha, Yama, Krutant, Gandharva, Bhrinyaraj and Mriga (Deer).
To reduce evil effects - keep this direction at a high level.
Walls thick and should have more weight towards this direction - Never keep this direction open.
For evil persons - Persons running Beer Bars, Playing Matkas, Running gambling dens - this direction is favourable.
If the entrance of the house is in south - it will lead to disease, mental unhappiness, fear etc.
Peepal tree in this direction leads to court cases and there will be problems to children
Water storage, ponds, wells, river etc. on south are inauspicious.