Riverina Local Land Services (LLS) suspect dormant locust eggs may form localised bands when they hatch later this month.
The LLS has identified hibernating eggs in areas north of Narrandera and around Jerilderie as a cause for concern.
Senior biosecurity officer Toby O'Brien is urging local landowners to be vigilant and report locust activity immediately if sighted.
"We did have some eggs laid in Autumn that have hibernated for winter, and these will start hatching from late September onwards," Mr O'Brien said.
"Landholders are our eyes and ears on the ground, and reporting locust activity early allows us to be on the front foot with them."
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Adult plague locusts usually lay eggs on compact roads next to crops, tree lines and farm buildings.
Mr O'Brien detailed the best time for landholders to control outbreaks is when locusts begin to 'band'.
"There is nothing you can do to prevent locusts, but we can control them when they're on your property," Mr O'Brien said.
This follows a statement by Minister for Agriculture Adam Marshall urging landowners to be on the lookout for locust activity.
"Locust outbreaks can potentially affect very large areas of crops and pasture, and if not controlled, can cause significant economic loss to farmers," Mr Marshall said.
"LLS biosecurity staff are trained in locust identification and control options, so if you think you've found signs of activity, reach out immediately."
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