Farmers in north-west New South Wales are being warned by the Australian Plague Locust Commission (APLC) to prepare for a bumper locust season.

Reports state that locusts have already caused damage to some crops in the state's south and in the far west, baby locusts have been spotted.

The APLC has told farmers that if they spot any locust activity on their properties, then they should report it.

Its director, Chris Adriaansen, said, "The major issue is that the swarms that will develop from there, and despite all the efforts that ourselves and landholders and the department are putting in, there will be swarms in April, we're quite convinced of that."

He added that these swarms would set up a spring generation and are likely to move south-east and south-west.

Reports also state that NSW could face the worst locust plague in more than six years. Experts have stated that the locust has done enough damage to crops already.