Yes, DITAS is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, T 1, A 1, S 1.

Is it a valid word?

DITAS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

evergreen tree of eastern Asia and Philippines having large leathery leaves and small green-white flowers in compact cymes; bark formerly used medicinally

Also: dita bark, devil tree, alstonia scholaris.