What substance, created by voracious larvae, mixes with and heavily contaminates stored grain, reducing it to fine powder?

Answer

Frass

The larvae reduce whole grains to a fine powder called 'frass,' which mixes throughout the remaining product, making separation nearly impossible and heavily contaminating the food.

What substance, created by voracious larvae, mixes with and heavily contaminates stored grain, reducing it to fine powder?

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