Ha! Since when is Wikipedia an authoritative commentary on Bible passages??

NOWHERE does it say that the white rider brings pestilence. He is clearly a conqueror who will establish a false and temporary peace. However, the fourth rider (Death) will "kill by sword, famine and plague..." Some translations substitute "pestilence" for the word "plague."

What the Bible describes is a progression. Start with a false peace (white rider), then war (red rider), then famine (black rider), and then finally death (black rider).