Hundreds of cartons of nappy pants remain unaccounted for after an invasive grain pest was discovered in the imported products on September 7.

Investigations are continuing into how khapra beetle larvae came to be in a box of Little One's Ultra Dry Nappy Pants in Walker Size 5.

Khapra beetle is among the biggest threats to Australia's multi-billion-dollar grains industry and could have major trade implications if it were to establish here.

NSW Farmers president Xavier Martin said if khapra beetle was not contained, "the damage will be beyond our worst nightmare".

"This detection is the wakeup call our government needs to get serious on biosecurity," Mr Martin said.

"This is a pest that would have the same impact as a foot and mouth animal disease outbreak in Australia, and it’s the

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