Dorylus orientalis

Systematic position Dorylus orientalis belongs to the order Hymenoptera, family Formicidae. Known as a subterranean ant, this species is highly specialized for life within the soil profile. Unlike surface-dwelling ants, they are rarely seen by farmers, which makes the early detection of their presence particularly challenging.

Host crops and pest status These ants are significant agricultural pests, particularly in tropical and subtropical regions. They primarily feed on the roots of vegetables, tubers, and various seedlings. Economic losses are severe in carrot, potato, and onion crops, where the ants destroy the root system or tunnel directly into the underground edible parts of the plants.

Biology and life cycle Dorylus orientalis is categorized as a species of driver ant. They do not maintain permanent, stationary nests. Instead, the colony is constantly mobile, moving through soil galleries and pre-existing tunnels. Their reproductive cycle and larval development occur entirely underground, fueled by the consumption of organic matter and the roots of living plants.

Damage and severity The damage is twofold: direct mechanical destruction of plant tissues and secondary impact. By chewing through roots and stems, they prevent nutrient uptake, causing plants to wilt and die. Furthermore, the tunnels created by the ants create pathways for various soil-borne pathogens, including bacteria and fungi, to invade the weakened plants.

Control measures Managing this subterranean pest requires targeted intervention:

• Application of systemic granular insecticides within the root zone.
• Soil treatments with specialized chemicals to create protective barriers.
• Deep tillage practices to disrupt the ants' movement tunnels.
• Monitoring soil moisture to predict periods of increased subterranean activity.