Networks are getting itchy trigger fingers.

In rapid succession, a flurry of struggling shows are being yanked from the schedule.

NBC’s “The Black Donnellys,” The CW’s “7th Heaven,” Fox’s “Wedding Bells” and ABC’s “Six Degrees” have either been pulled off the air or ceased production early this week as networks reconfigure their schedules for May sweeps.

• The David E. Kelley’s dramedy “The Wedding Bells” has ceased production, but the network plans to air three more episodes. The Friday night drama most recently earned a mere 1.4 rating among adults 18 to 49.
  
  
• ABC pulled “Six Degrees” last fall, then brought back the show as a March addition to Friday nights. Its last airing earned a 1.1 rating. Repeats of “Wife Swap” will air in its place.
  
  
• NBC’s mob drama “Black Donnellys” filled a Monday night hole vacated by “Studio 60 on the Sunset Strip” and has bled viewers nearly ever airing. Last night’s episode earned a 2.0 rating. “Donnellys” will be replaced by the reality series “The Real Wedding Crashers.”
  
  
• The CW’s “7th Heaven” will finish its final season, with a finale to air May 13, but will not return this fall.