With the recent rains across the district, it is time for landholders who have previously had outbreaks of Parthenium (Parthenium bysterophorus) on their properties to monitor the sites of infestation.

Ian Schwartz, the Shire's Noxious Weeds Officer, said Parthenium is one of New South Wales' most serious weed threats.

"Once established, it can create a seed bank in the soil that is viable for 15 years or more," he said.

Parthenium seeds are transported from infested areas via hay harvesting machinery and support vehicles, livestock transports and tourist vehicles.

Landholders can help restrict the spread of Parthenium by asking for the appropriate crossing papers when they engage harvest contractors who have been working in Queensland.

They should also ask their contractors where their last job was in Queensland and record this information.

Mr Schwartz said Parthenium is a Class 1 Notifiable Weed in New South Wales.

"Any infestations must be reported within three days of detection," he said.

If you suspect a plant could be Parthenium weed, note the location and report it to the New South Wales Department of Industry and Investment or your local council Weeds Officer.

Any landholder who suspects they have found Parthenium on their property should not attempt to control it themselves. If it is confirmed as Parthenium, Council and New South Wales Department of Industry and Invesment carry out control work.

The location of Parthenium outbreaks on private property is kept strictly confidential and the inital control costs of notified Parthenium outbreaks are covered by a contigency fund allocated by the Minister for Industry and Investment.

As well as being one of New South Wales' most serious weed threats, Parthenium is noted as a Weed of National Significance.