What is the swarming behavior of Formosan termites most closely associated with?

The swarming behavior of Formosan termites is most closely associated with high humidity. This is because these termites prefer moist conditions for their reproductive activity. Swarming typically occurs during specific times of the year, particularly in the spring and early summer, when environmental humidity levels are higher. This climate supports the survival of the nymphs that emerge from the swarming process, as they are more likely to find suitable shelter and food sources in these conditions. High humidity enables better survival rates for the newly formed alates, as well as facilitating flight and dispersal during their mating rituals.

In contrast, rainy days can indeed influence their behavior, but it's the overall humidity that is more critical for their swarming activities. Windy nights do not provide the stable atmospheric conditions necessary for successful swarming and flight. Cold temperatures are generally unsuitable for Formosan termites, as these conditions can hinder their activity and survival, making them less likely to swarm.