What is the preferred humidity level for booklice?

Booklice thrive in environments with high humidity levels, specifically between 75-90 percent. This high humidity range is conducive to their reproduction and survival, as booklice require moisture to support their metabolism and maintain their physical integrity. In such humid conditions, their preferred food sources, such as mold and fungi, are also more likely to proliferate, providing an ample supply of nutrition.

Lower humidity levels, as indicated in the other options, do not support the ideal environment for these pests. At humidity levels below 75 percent, booklice may struggle to thrive and reproduce effectively, leading to population declines. Thus, understanding their preference for high humidity is crucial for both pest management strategies and creating environments that deter these insects.