log messages very huge

Hello.

I have installed Plesk Web Host Edition version 12.5.30 Update #48 on a CentOS Linux 6.5

The file log /var/log/messages increased his size about 140MB every day

I edited the log and found a lot of entries like those

Sep 29 11:24:02 ns3 named[30134]: client 67.93.217.243#24239: query (cache) 'sb.yz968.com/A/IN' denied

Sep 29 11:24:02 ns3 named[30134]: client 11.49.12.65#8355: query (cache) 'etydorwp.0011game.com/A/IN' denied

Sep 29 11:24:02 ns3 named[30134]: client...

log messages very huge