What environmental condition can lead to increased pest activity?

High humidity can significantly contribute to increased pest activity due to the favorable conditions it creates for many pests. Many insects thrive in humid environments because these conditions facilitate their reproduction and survival. For example, certain pests such as aphids and spider mites tend to multiply rapidly when humidity levels are elevated, leading to larger infestations. Additionally, high humidity can promote the growth of fungi and bacteria, which can attract pests that feed on them.

In contrast, lower temperatures typically slow down pest activity as many insects become less active or enter dormancy during cooler periods. A decrease in soil moisture usually leads to drier conditions that are less favorable for pest development, while high winds can disperse pests and affect their movement and survival. Therefore, high humidity stands out as a key environmental factor that directly fosters an increase in pest populations.