However, three tries between the 50th and 56th minutes took the game away from the home side, whose tackling continues to let them down.
Poverty Bay hit back with a try to prop Jone Lesi in the 63rd minute to salvage a bonus point but their Meads Cup hopes are all but over.
They are sixth with 12 points, needing to beat Thames Valley away in the penultimate game and then East Coast at home in two weeks, both with bonus-point wins.
Poverty Bay 33 (Paul Tikomainaivalu, Nick Wilson, David Philander, Jone Lesi tries; Scott Leighton 2 cons, 3 pens) South Canterbury 52 (Kali Latu 2, Sam Vea, Eric Smith, Liam Edwards, Jared Trevathan, Faa'atu Tuamoheloa, Sekope Maea tries; Liam Edwards 6 cons). HT: 25-26.
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