Cuckoo wasp

Systematic position: The cuckoo wasp (Dolichovespula adulterina) is a member of the Hymenoptera order and the Vespidae family. It is a specialized social parasite that has evolved to exploit the colonies of other wasp species within the Dolichovespula genus.

Biology and life cycle: Unlike standard social wasps, D. adulterina does not have a worker caste. The queen enters the nest of a host species, eliminates or dominates the host queen, and tricks the existing workers into rearing her own brood of males and queens.

Damage and impact: While they do not directly feed on crops, their presence causes an ecological imbalance. By usurping host nests, they reduce the population of beneficial wasps that contribute to natural pest control and the pollination of various wild and agricultural plant species.

Host interaction: The host species, typically Dolichovespula saxonica or D. norwegica, are often beneficial insects. The parasite drastically reduces the reproductive success of these hosts, which can indirectly impact the stability of local insect communities and agricultural biodiversity.

Control measures: Integrated pest management strategies include:

• Deploying attractant traps during the queen emergence period in spring.
• Monitoring garden structures and outbuildings for the presence of host nests.
• Maintaining healthy environments that do not attract aggressive or invasive Vespidae species.