Primary Industries Minister Steve Whan says if the locusts aren't treated when they're crawling, they might develop into one thousand hectares of adult swarms, which can travel up to 600 kilometres or more in a single night.
The first hatching at Nyngan was reported this week by a farmer.
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Rangers have also confirmed a second spate of hatching locusts at Byrock, between Bourke and Nyngan.
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