What do psocids and grain mites require to build large populations?

Psocids and grain mites thrive in environments with high humidity because moisture is crucial for their reproduction and survival. These organisms prefer damp conditions, as humidity allows them to stay hydrated and facilitates the growth of mold and other organic debris, which serve as their food sources. In such humid environments, they can reproduce more rapidly and in larger numbers, leading to significant population increases.

Low temperatures, dry environments, and darkness do not support their population growth effectively. While darkness may be a factor in their behavior, it does not directly contribute to the rapid population increase that high humidity enables.