Growing Sweet Potato, also Kumara

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05 Aug 14 Peter Wheldon (Australia - sub-tropical climate)
I saw Jerry Coleby-Williams of Gardening Australia use a crop of marigold in a garden bed for a season to 'gas' or fumigate the nematodes organically. Apparently farmer's friends or cobblers pegs do the same thing. So you could pull the kumara up, cultivate the bed and plant a heap of marigold in to deal with the nematodes if that is what the grubs were.
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