The poster, which has been put on a prominent road crossing in the city, is signed by one Vikas Kumar Jyoti, who, the party claimed, was not associated with the AAP.
Dikshit is said to have issued a letter to all ministers and Congress MLAs asking them to follow the decision of the Congress Working Committee (CWC) and party president Sonia Gandhi in practicing austerity.
The Delhi high court on Thursday refuses to entertain a public interest litigation (PIL) seeking the removal of Arvind Kejriwal as chief minister following his arrest by the Enforcement Directorate in the excise policy-linked money laundering case.