Giant dung beetle

The Giant dung beetle (scientific name: Lethrus cephalotes) is a member of the Coleoptera order and the Geotrupidae family. Despite being in the dung beetle group, this species is a notorious agricultural pest known for its destructive feeding habits on various cultivated crops, residing primarily in complex underground burrow systems.

This pest is particularly damaging to winter cereals, spring wheat, barley, sunflowers, legumes, and young grapevines. The adult beetles are highly active in the spring, coinciding with the early emergence of seedlings. Their feeding behavior is specialized, focusing on harvesting green plant parts to sustain their subterranean offspring.

The biological cycle involves deep soil nesting, where adults hibernate at depths ranging from 50 to 100 cm. In the spring, they emerge to feed and breed. Females construct vertical burrows and create bundles of cut vegetation, known as "cigars," which serve as the food source for larvae. The development from egg to adult takes place entirely underground throughout the growing season.

The primary damage consists of adults cutting off the stems and leaves of young crops, which are then dragged into the burrows. This results in patches of thinning crops and significant stand loss. If left uncontrolled, the population can rapidly increase, leading to severe economic losses for farmers, particularly in fields adjacent to uncultivated lands or pastures.

Effective management strategies focus on both mechanical and chemical control. Deep plowing of the soil is highly recommended to destroy the burrows and expose larvae and adults to predators or environmental stress. During outbreaks, targeted insecticide applications along the edges of the fields are essential, as are specialized poisoned baits placed at the entrances of active beetle burrows.