One of the biggest threats to Australia's multi-billion-dollar grains industry has been discovered in a box of children's nappy pants imported to Australia.

The origin of the khapra beetle larvae, found in the nappy pants on September 7, is under investigation by the Department of Agriculture, Fisheries and Forestry (DAFF), which has ordered that the products be removed from supermarket shelves and secured.

Australia is currently free of khapra beetle, which DAFF has listed as the number-one-priority pest for grains, but if the beetle became established it could derail global trading for Australian grain.

"If the beetle was to establish here, many of our trading partners would reject stored produce from Australia," DAFF explained on its website.

"Given that Australia exports much of th

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