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Chilled brood occurs when the brood chamber becomes too large for the bees and they cannot keep the developing young warm. Brood killed in this manner turn gray and may resemble sacbrood.

There is no actual treatment for chilled brood; once the weather warms or the colony grows, they will be able to care for the brood more effectively.

Do not work your bees in cold weather, replace frames in the same order they were removed when performing cool weather inspections, and do not leave frames of brood outside of the hive for any longer than absolutely necessary.