The UK spud watchdog stated average prices had risen last week to £117.87/t - an increase of almost £13/t.
"Prices in Cornwall have eased slightly," said the Potato Council's latest report. "Jersey deliveries remain limited as growers clear crops which have not reached full potential. Dry conditions continued to the end of last week with no rain recorded for over three weeks. Crops were beginning to suffer and irrigation was being used where possible in an attempt to increase recent slow bulking rates."
Prices in the free market were up by £7.53/t to £91.84/t.
Early potato production in the Mediterranean, Middle East and Northern Europe has also been affected by the fierce winter.
The Potato Council report added: "Production in Israel is estimated to be 30 per cent lower and plantings in Spain are 50 per cent down compared with 2009. The Cyprus spring crop was damaged by flooding and frost, with an estimated 30 per cent drop in yield."
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