Tetrastichus dryi

Tetrastichus dryi is a species of hymenopteran parasitoid belonging to the family Eulophidae. It is recognized globally by agronomists as a highly specialized primary parasitoid that exerts significant pressure on populations of agricultural pests, specifically the African citrus psyllid.

The primary host for this species is the citrus psyllid (Trioza erytreae), which infests various citrus crops. By targeting the larval stages of the psyllid, this wasp provides essential ecosystem services in citrus orchards, preventing the development of severe foliage damage and the spread of citrus greening disease.

The life cycle of Tetrastichus dryi is strictly synchronized with the development of its host. The adult female wasp oviposits directly into the psyllid nymph. The developing wasp larva consumes the host from the inside, effectively terminating the psyllid's development before it can reach the adult reproductive stage.

The impact of this insect is purely beneficial, as it functions as a natural pest suppressor. It does not damage plants directly; rather, its «harmful» effects are aimed exclusively at the invasive citrus psyllid, significantly reducing its density and preventing the formation of characteristic leaf galls.

Integrated Pest Management (IPM) programs emphasize the protection of Tetrastichus dryi populations. Key management strategies include the reduced use of broad-spectrum chemical insecticides that prove fatal to beneficial parasitoids. Preserving native vegetation around orchards can provide necessary nectar sources and resting sites for the adult wasps.