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Coptotermes gestroi

life science Maturity 5-7 Next article →

The Asian subterranean termite, known scientifically as Coptotermes gestroi, is a small insect that lives underground. In parts of Asia, this species is often called the Philippine milk termite. These termites are considered highly destructive pests due to their eating habits. They are native to Asia but have spread globally over the last century. They can cause significant damage to both natural environments and manmade structures. Understanding their biology and movement is vital for managing their impact on the world.

A single colony is organized into three distinct biological groups called castes. The first group is the workers, which are small, white, and translucent. Workers are essential because they feed the rest of the colony and care for the young. The second group consists of the soldiers, which are larger than workers. Soldiers have dark brown heads, ovoid shapes, and forward-pointing mandibles for defense. They also possess a fontanelle, which is an opening on the forehead used to extrude a white defensive secretion. The third group is the reproductives, which include the king and the queen.

The reproductive process begins when a mature colony produces winged individuals called alates. These alates emerge above ground to form massive swarms containing many thousands of insects. This swarming behavior typically occurs at night during the spring months. Once the alates land, they shed their wings to begin the next stage of their life cycle. A male and female will search for a suitable site with moist timber and damp soil. They create a nursery chamber in a crevice to lay their eggs. A female typically lays between 15 and 30 eggs at a time.

Once the eggs are laid, the king and queen take over their care. The workers from the first batch of eggs assist in rearing the new generation. It can take several years for a colony to grow large enough to produce its own winged alates. During this time, the queen's abdomen grows enormously in size compared to the king. Because the queen is so specialized for laying eggs, she cannot feed herself. The workers must provide her with constant nourishment to sustain her life of continuous egg-laying.

Taxonomic history shows how scientists have clarified the identity of this species. In 2003, researchers Kirton and Brown studied the status of various pest species in Southeast Asia. They determined that Coptotermes havilandi was actually identical to Coptotermes gestroi. Following the scientific principle of priority, the older name, C. gestroi, became the official name. This research helped resolve confusion regarding the taxonomic status of these invasive termites. It ensures that scientists around the world are using the correct name for the same insect.

Coptotermes gestroi has a very wide and impressive global distribution. It is endemic to Southeast Asia, but it has traveled to many other regions. It reached the Marquesas Islands in 1932 and Mauritius in 1936. It arrived in Réunion in 1957 and Barbados in 1937. In the United States, the species is found in southern Florida, specifically in Broward and Miami-Dade Counties. It was discovered in Hawaii in 1963 and later found in Fiji in 2009. Researchers believe they may reach mainland Florida by traveling on boats.

These termites are voracious feeders that seek out materials containing cellulose. They consume wood, paper, cardboard, and even fabric. They are so determined that they will drill holes through rubber, plastic, and styrofoam to find food. In buildings, they enter through cracks, utility conduits, or expansion joints. They often eat structural timbers from the inside out, leaving only a thin, blistered film of wood on the surface. They also attack the heartwood of living trees, which can cause trees to fall during storms.

The impact of these termites is massive in certain parts of the world. In Malaysia and Singapore, they are responsible for 80% to 90% of all insect damage to manmade structures. An average foraging population in a single colony in Thailand can range from 1.13 to 2.75 million individuals. In Florida, they are often found in manmade structures and boats, whereas in the West Indies, they inhabit natural woodlands. This species can also hybridize with the Formosan subterranean termite, C. formosanus, in Florida. This interaction adds another layer of complexity to how they affect local ecosystems.

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