The by-poll is necessitated following the death of sitting Congress MLA R Venkata Reddy and the party has decided to field his widow, Sucharita Reddy as its nominee.
The ruling TRS has chose State Roads and Buildings minister Tummala Nageswara Rao as its candidate.
Chief Minister K Chandrasekhar Rao's son state IT and Panchayat Raj Minister K T Rama Rao has been appointed as party in charge for the election.
State Congress president N Uttam Kumar Reddy has written to the parties to let the Congress nominee be elected unopposed. Party working president M Bhatti Vikramarka also called on TDP Telangana unit president L Ramana, YSR Congress president YS Jaganmohan Reddy and leaders of other parties with the request.
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Heeding to the request, YSR Congress and TDP have announced their decision not to field their candidates.
Responding to other opposition parties supporting the Congress in the bypoll, Rama Rao criticised them for the move.
"TDP and YSR Congress, which are anti-Congress in nature, have now come together to defeat the TRS in the Palair bypoll," he alleged.