The England Under 21 international striker opened the scoring on 25 minutes and Kevin Doyle doubled the lead on 42 minutes.
The result was never in doubt when Stephen Hunt made it 3-0 seconds before the break.
Lita then grabbed his second of the game to make it 4-0 and Simon Cox grabbed a fifth on 70 minutes.
Lita then completed his hat-trick by netting The Royals sixth goal of the game.
Reading: Stack, Murty (Castle 59), Hunt (Shorey 45 (Hunt 59)), Ingimarsson (Mullins 53), Sonko, Harper (Howell 59), Sidwell, Doyle (Cox 64), Hayes (Convey 45), Kitson (Little 53), Lita.