What is the function of screen bottom boards in a hive?

Screen bottom boards serve a vital function in beekeeping primarily by providing drainage and ventilation within a hive. Their design allows excess moisture to escape, which is crucial for maintaining a healthy environment for the bees. High humidity levels can lead to issues such as the growth of mold or other fungal infections. By enabling proper airflow, screen bottom boards help regulate temperature and moisture, promoting a more optimal climate for the brood and the overall health of the colony.

Moreover, the open structure of screen bottom boards can also help in managing pests like Varroa mites. Any fallen mites or debris can drop through the screen, reducing their chance of re-entering the hive and affecting the bees. This function thus supports both the hygiene and sustainability of the hive.

Other options, while relevant to various aspects of beekeeping, do not capture the primary purpose of screen bottom boards as effectively. For instance, increasing heat retention does not align with the purpose of these boards, as they generally promote ventilation rather than insulation.