Although the seed corn maggot is seen in some fields every year, it appears to have affected more crops in 2010.
Fears have now been voiced that seeds could fail and yields may be reduced.
Cool, wet soil is thought to be behind the increased infestation.
The news is likely to come as a blow to potato farmers, many of who are already fighting wireworms in fields that were formerly perennial grasses.
Cedric Porter is Managing Editor World Potato Markets and GUEST SPEAKER at #IPPSC2015 #PotatoBusiness #potato http://t.co/HTVS8CKafr