Primary producers are being warned to keep an eye out for unwanted pests and diseases that might spread due to natural disasters.
Flood water and winds are just some of the ways weeds and viruses can be moved.
Rod Turner from Plant Health Australia says primary producers need to be on the look out for biosecurity hazards as they recover from natural disasters.
"The wind can blow leaves and debris away from plants and take plant diseases with them, or flood waters can move weed seed, and they can also take diseases and pests with them."
Mr Turner says biosecurity hazards could threaten key primary industries in the Northern Territory such as mangoes, melons and cattle.
He says producers should keep a close eye on areas of land hit by natural disasters.
"The other key area is often after these events with cyclones or rain you get lots of people coming onto properties to repair telephone lines or even coming to fix fences.
"Those sorts of people who move from property to property are a very effective means of spreading these things around."
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