Victoria's state-owned logging company breached rules protecting native animals and rainforests almost 30 times over three years, environment groups allege in a new report.

The report comes after a dead koala was found in a logged section of forest in the Acheron Valley near Marysville that was home to the endangered Greater Glider.

The Greater Glider is in decline with environmentalists concerned about continued logging.

As revealed by Fairfax Media earlier this year the state government could have protected the region but ignored advice from its own scientific committee.

Now the latest report alleges there were 27 cases of logging in East Gippsland and the Central Highlands in the past three years that breached an environmental code of practice.