These are often called primary reproductives. At certain times of the year, a mature colony will produce these in large numbers and they will swarm when conditions are right. This generally coincides with rainfall. Formosan termites tend to swarm at dusk or early evening. These are often called “swarmers” and can be seen around street lamps and other lit areas. Their flights are generally short. Although not strong flyers, they can be carried by wind and air currents. Formosan termite colonies are considerably larger than other subterranean termite species and can comprise of several millions. Therefore, when flying termites occur, formosan swarmers are in more abundance. They are typically 12-15mm long. Other species will also swarm at different times of the day depending on the weather conditions.

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