Burrower bug

Systematic position. The pest Pangaeus docilis belongs to the order Hemiptera and the family Cydnidae (burrower bugs). In agronomic practice, this species is classified as a soil-dwelling pest that often evades detection due to its cryptic lifestyle beneath the soil surface.

Affected crops. This bug primarily causes damage to cereal crops, including corn, sorghum, and wheat. Damage has also been documented on vegetable crops and various grasses, where the pest feeds on the subterranean parts of the plants during the early stages of their development.

Biology and life cycle. Adults and nymphs of Pangaeus docilis live within the soil, which complicates population monitoring. The life cycle consists of the egg stage, several nymphal instars, and the adult stage. The pest prefers areas with sufficient soil moisture, moving through the soil to locate host plants and piercing their roots and underground stems for nourishment.

Damage patterns and economic impact. The primary injury occurs through feeding on the root system and the base of the stem in young plants. As a result, plants exhibit stunted growth, chlorosis, and, in cases of high infestation, total mortality. In fields, this manifests as irregular patches of thin or dead stands, significantly reducing crop density and total yield.

Protection measures. Controlling this species is challenging due to its subterranean habitat. Effective management strategies include:

• Strict crop rotation to interrupt the pest's life cycle.
• Thorough soil tillage to disrupt overwintering sites and movement tunnels.
• Use of systemic insecticide seed treatments to protect seedlings during the critical initial stages.
• Conducting regular soil sampling and scouting during early spring to determine population density.