The sporting event in Glasgow was launched last night with dancing Tunnock's Teacakes and Scottie dogs featuring in the opening ceremony.
But while opening a debate on food and agriculture, Lord Plumb told peers: "Whilst I'm sorry the minister is not with us, not able to attend this debate, I'm pleased it's because he's actively promoting the strengths of the UK food and farming sector today to an international audience in Glasgow during the Conservative Games."
The peer continued with his speech before Labour's Lord Reid of Cardowan, a former Cabinet member, intervened.
To laughter, Lord Reid told Lord Plumb: "It may be a slip of the tongue. I can assure you that Glasgow has never been a welcoming host for Conservative Games.
"I take it you meant the Commonwealth Games?"
Lord Plumb replied: "I stand corrected, and knowing my age I thought I said the Commonwealth Games."