Kolkata, Aug. 21 -- Retail sugar prices have shot up to Rs 70 per kg in Kolkata markets ahead of the festive season, traders said on Friday.

Prices have surged by Rs 20 a kg in the past month alone, while the last four to five days have seen a sudden 10 per cent jump, they said. Sugar-associated products such as jaggery, batasa (sugar drop), and nakuldana are also witnessing a similar spike.

The Centre on Thursday evening allowed sugar mills to import one million tonne of raw sugar, a measure last resorted to a decade ago, but its impact is yet to trickle down to retail markets, traders said.

The government has also imposed a stockholding limit on bulk customers who consume more than 10 tonne of sugar a month, capping their stock at 15 d...