Since the Formosan subterranean termite is a weak flier and does not spread rapidly by itself, the movement of infested soil or material such as lumber, wooden crates, or other wooden products is another important method by which it spreads. These termites are commonly associated with the railroad ties used for landscaping. In the United States, the Formosan subterranean termite generally has been confined to the southeast at about 32.5 degrees N latitude. This latitude coincides with the warmer temperatures usually associated with this termite. However, the widespread use of central heating in the United States may encourage the spread of the Formosan subterranean termite.
Central heating provides a warm environment conducive to the survival of termites during winter.
Major swarms of the Formosan subterranean termite begin in May or June and last until about July or August. On humid, still evenings, usually around dusk, large numbers of swarming alates can be seen around light sources. They are attracted to light. After a short flight, alates drop to the ground, shed their wings, and pair off. If they successfully find a small crevice containing moist wood, the pair forms a chamber and lays eggs.