The EU enlargement revives the debate around the participation to the EMU. The accession to a monetary union can affect trade through several channels. In this paper we study the link between the membership to a monetary union and informal barriers to trade. The question we ask is whether the participation to the Euro Area reduces the impact of informal barriers on new members' agricultural trade. We base our analysis on Greek imports of agricultural products from partners in the Euro area and third countries between 1996 and 2005. A first result we find is that the country's accession to the Euro zone has reduced the effect of information flows on its imports of agricultural products from EMU partners. Secondly, institutional aspects have become a less important determinant of Greek imports from all countries. After 2001 non-EMU suppliers are viewed by Greek partners as more homogeneous in terms of institutions' quality.