This is according to two peak education bodies, who say the faux pas has made Mr Ferguson look silly.

On Monday the Greens asked Mr Ferguson to relinquish the education portfolio over the issue.

The election campaign material in the form of letters were addressed To the Householder and distributed among communities in the state that have less than the minimum number of students enrolled in their local school in the past week.

They include Bracknell, Campania, Bicheno and King Island.

Australian Education Union state president Terry Polglase said it was particularly disappointing King Island had received the letters as they had no other choice on the island as to where to send their children.

Tasmanian Association of State School Organisations president Jenny Eddington said the islands as well as the West Coast were not considered in the report because of their remote location, so it made no sense for them to be brought into the election campaign now.

She said enrolment numbers were also just one aspect of the criteria to close a school.

Bracknell Primary School association chairwoman Kelly Tubb said the campaign material was being used as a scare tactic.

"He could have delivered a much stronger Liberal message if he said what he could provide for our little school instead of being so negative," Ms Tubb said.

She said the Bracknell community had put the threat of school closures behind them and moved on.

Mr Ferguson has previously said the material was a reminder of what the previous Labor-Greens government policy was and denied it was a fear campaign but one of fact.