The devourer— The moth. Houbigant. Any of those insects are meant which consume and destroy the corn.
Related Commentaries of Malachi 3:11
Malachi 3:11
11 And I will rebuke the devourer for your sakes, and he shall not destroyc the fruits of your ground; neither shall your vine cast her fruit before the time in the field, saith the LORD of hosts.