Also playing on Friday night were Otamatea, who moved past the Western Sharks with a 42-29 win, keeping them in fourth place and giving them breathing room over the chasing teams.
Meanwhile, Kamo picked up their first win in seven games with a 27-19 win over Hikurangi.
The premier reserve grade playoff hunt is also spicing up, with Hora Hora being hammered 51-12 by Mid Western.
Mid Northern were pushed by Wellsford, who are in search of a home semifinal, as the table toppers won 20-16.
Kamo's reserve team came away with a 52-29 win over Hikurangi, while the Western Sharks continued their strong season with a 41-10 win over Otamatea on Friday night.
Also on Friday night, Old Boys Marist sent a warning with a 48-nil whipping of Waipu.
For updated standings see Thursday's Northern Advocate.
Results:
Southern Districts Premier Grade
Mid Western 15 Hora Hora 12
Wellsford 28 Mid Northern 20
Kamo 27 Hikurangi 19
Otamatea 42 Western Sharks 29
Old Boys Marist 27 Waipu 18
Southern Districts Premier Reserve Grade
Mid Western 51 Hora Hora 12
Mid Northern 20 Wellsford 16
Kamo 52 Hikurangi 29
Western Sharks 41 Otamatea 10
Old Boys Marist 48 Waipu 0