Campaigns for the April 9 by-elections in Davanagere South and Bagalkot constituencies wrapped up on Tuesday evening.
Candidates are now restricted to limited door-to-door outreach due to the 48-hour silence period.
The elections were triggered by the deaths of Congress legislators Shamanur Shivashankarappa and H Y Meti.
The ruling party has fielded Samarth Mallikarjun in Davanagere South and Umesh Meti in Bagalkot, both relatives of the deceased legislators.
The ruling party continued its focus on its welfare programmes, presenting the bypolls as an assessment of schemes aimed at backward classes, minorities and economically weaker sections.
Chief minister Siddaramaiah and deputy chief minister D K Shivakumar led the campaign.
The BJP, meanwhile, framed the contests as a rejection of dynastic politics and questioned the state government's performance.
Polling will take place on April 9, with authorities declaring a holiday in the two constituencies to enable voting.
Votes will be counted on May 4.
