Lorenzo Langstroth observed this behavior about 150 years ago. Bees build comb in any space over 3/8 inch. They propolize every space less than 3/8 inch. Propolis keeps diseases, pests, and parasites from destroying the hive. If small nive beetles, wax moths and other invaders find a space to hide or lay eggs, they will. Propolis eliminates these spaces. Propolis is a wonderful mixture that keeps their environment nearly sterile.
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