A mealworm is the larva of a darkling beetle that infests grain products but is often raised as food for insectivorous animals, for laboratory use, or as fishing bait.
Positive: Dreaming of a mealworm invading grain could represent God pre-warning you about an upcoming attack so you can have the victory.
Negative: In a dream, mealworms could represent an infestation of the enemy in your everyday life. It could represent that you are being tested and watched.
(Luke 13:21; 1 Kings 4:22; Psalm 66:1).