Rovers' fate was effectively sealed after Jones was taken off - and taken the hospital - with a suspected broken arm after an aerial collision with Sean Morrison.
With Dickov having used his three substitutes, his side were reduced to 10 men for the last 12 minutes and almost nine minutes of stoppage time.
Reading took advantage scoring first through Garath McCleary, with a low shot after good work by Hal Robson-Kanu, and then through the back-in-favour Pavel Pogrebnyak to give the scoreline a flattering look.
"Reading started very quickly but, once I had changed the system, we got back into the game," Dickov said.
"I still fancied us to win the game at 2-1 down but playing with 10 men made it very difficult. Reading took full advantage of the situation and just picked us off.
"I still feel a bit aggrieved and disappointed about the scoreline. Although it was 4-1, I thought we competed well. The final ball just didn't come off for us.
"When we win matches, we try to draw the line under it quickly, and we'll be doing that with this game as well."
- Sports & Recreation
- Pavel Pogrebnyak