The number of Irish households grocery shopping in Northern Ireland has halved compared to 2009, according to new figures from Kantar Worldpanel.
The data shows that 8pc of households here bought groceries across the Border in the 12 weeks to June 10.
"The continued high cost of fuel and a weaker euro means that fewer shoppers are willing to travel to the north for their groceries and are instead looking for value at home," said David Berry, commercial director at Kantar Worldpanel.
Tesco retained its spot as Ireland's biggest grocery retailer in the reported period. It controls 28.6pc of the market compared to 27.7pc In the corresponding period last year. Dunnes Stores is second, with a 22.4pc share. That's down on the 23.4pc share it had a year earlier.
Superquinn's descent continued, with its market share falling to 5.5pc. That's down 10.5pc on the corresponding period a year ago.
It's now owned by Cork-based Musgrave, whose SuperValu chain saw its market share rise slightly to 19.8pc in the 12 weeks to June 10. German discounters Lidl and Aldi fared well in the latest roundup. Aldi has recorded sales growth of 20pc year-on-year to bring its market share to 5.3pc -- on par with Superquinn. Lidl's now stands at 6.5pc, compared to 6.3pc a year earlier.
Kantar said that overall spending in the Irish market remains subdued in the current economic climate. It added that the decline in total grocery sales here accelerated from a fall of 0.2pc in May to a 0.5pc drop this month. Sales of alcohol rose 4.4pc in the past four weeks as people stocked up to watch the Euro 2012 football championship at home.