John Lamont, Scottish Conservative chief whip, said:
"Kezia Dugdale's speech today has been entirely over-shadowed by the shambolic nature of this conference and the intervention by the London Mayor. The chaos we're seeing in Perth only serves to demonstrate - once again - that Scottish Labour is a total mess and simply can't be trusted to hold the SNP to account.
"Kezia Dugdale's big idea of a petition against a second referendum is laughable. It comes seven months after Ruth Davidson launched our own. What's more, this is the same Kezia Dugdale who, only a year ago, was saying her MSPs could vote for independence if they wished.
"The truth is only the Scottish Conservatives can be trusted to campaign four square against the Nationalists' attempt to impose a second referendum on Scotland.
"After this weekend of chaos, nobody can have any faith in Scottish Labour to provide the strong opposition Scotland so desperately needs."