The Pirates will try to break the four game losing streak tonight at PNC Park The Pirates start Ivan Nova (2-0) on the mound. He will face  Joe Mustgrove (1-1). Musgrove is making only his fourth start of the season.  Rookie Josh Bell is a raw talent at first base. Manager Clint Hurdle says he needs work in the field.  Hurtle has assigned John Jasso to help him improve his work at first base.  Bell is an outfielder transitioning to first base.   The move indicates that Bell will be here for awhile.  Pirates and Astros tonight on WBVP-WMBA.  Airtime is 6:40.