What environmental factor can cause Chilled Brood in a bee colony?

Chilled Brood in a bee colony occurs when the developing larvae are subjected to temperatures that are either too cold or fluctuating significantly. This condition typically arises when there is insufficient warmth for the brood, leading to a situation where the larvae fail to develop properly and may die.

When temperatures drop, the worker bees may not be able to maintain the necessary warmth in the brood area. Brood temperature is critical for larval development; ideal temperatures are usually maintained at around 92-95°F (33-35°C). If this temperature drops, which can happen during late spring or early fall when days are warm but nights are cold, it can lead to the chilling of the brood.

Excessive heat, on the other hand, can cause different problems for a colony, including stress or a decrease in hive productivity, but it does not specifically lead to Chilled Brood. Similarly, humidity levels and lack of sunlight can influence bee health and behavior, but they do not directly result in the chilling effect on developing brood as described in this scenario. Thus, understanding the critical temperature range for brood care is key in preventing issues like Chilled Brood.