According to Mainichi, the airing of Beelzebub was suspended from March 20th because the content of the anime was considered to be unsuitable to the current situation resulting from the earthquake. Yomiuri TV will air Yumeiro Pâtissière instead. It hasn’t been fixed as to when Beelzebub will be resumed.
Aww. I haven’t started watching this but another sad news. I hope it will resume soon. 🙂