The organisation's Victorian regional officer Dr Patrick Kluver said the problem could be combated through farm biosecurity planning as part of their monitoring and treatment regime.

"Many producers don't realise there is an almost 50 per cent chance of introducing lice when you buy new sheep," says Dr Kluver.

"If you're purchasing sheep of any type, reduce the risk by insisting on a sheep health statement, and inspect the sheep yourself with 10 to 20 sheep, carrying out 10 partings per side."

He said new sheep should be quarantined in a separate paddock from other sheep for three to six months, or until the next shearing.

Dr Kluver said that straying sheep from nearby properties also pose a lice risk and livestock owners should discuss strategies with neighbours to prevent and manage lice problems for the benefit of all in their area.

"Talk to your neighbours about having a written stray policy, which clearly states what you want done with your sheep if they are found in a neighbour's place, and vice versa. Just throwing them back over the fence is not a good policy," he said.

Wool Producers Australia chief executive Jo Hall said regular monitoring and early detection was critical.

"All mobs should be inspected at least twice a year, ideally when sheep are mustered for other management procedures such as drenching," Ms Hall said.

"Target any sheep that are seen with rubbed or pulled wool and if lice are present consider using a long wool treatment."

For a full list of techniques and chemical options, and application methods in short and long wool visit www.liceboss.com.au.