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Passaloecus
Picket-boring Aphid Wasps
Passaloecus is a genus of small solitary wasps in the family Crabronidae, commonly known as picket-boring aphid wasps. The genus comprises approximately 40-48 species worldwide, with strong representation in both the Nearctic and Palearctic regions. These diminutive wasps, typically 6-8 mm in body length, are specialized predators of aphids and serve as important biological control agents. Females construct nests in pre-existing cavities such as beetle borings in dead wood, hollow stems, and artificial trap nests, provisioning cells with paralyzed or dead aphids for their larval offspring.