Pteromalids (Pteromalidae)
The family Pteromalidae belongs to the order Hymenoptera, specifically the superfamily Chalcidoidea. While many species are recognized as beneficial parasitoids that help regulate other insect populations, some species are recognized as significant pests that feed on plant tissues, specifically seeds of legumes and other crops.
What the section contains
Spalangia cameroni
Spalangia cameroni
Spalangia drosophilae
Spalangia drosophilae
Spalangia nigroaenea
Spalangia nigroaenea
Spalangia rugosicollis
Spalangia rugosicollis
Sphegigaster
Sphegigaster
Sphegigaster orobanchiae
Sphegigaster orobanchiae
Sphegigaster pallicornis
Sphegigaster pallicornis
Sphegigaster pedunculiventris
Sphegigaster pedunculiventris
Stenomalina
Stenomalina
Stenomalina gracilis
Stenomalina gracilis
Theocolax
Theocolax
Theocolax elegans
Theocolax elegans
Theocolax formiciformis
Theocolax formiciformis
Tomicobia seitneri
Tomicobia seitneri
Trichomalus
Trichomalus
Trichomalus cristatus
Trichomalus cristatus
Trichomalus herbidus
Trichomalus herbidus
Trichomalus perfectus
Trichomalus perfectus
Trichomalus spiracularis
Trichomalus spiracularis
Pteromalids (Pteromalidae)
These pests primarily target legume crops such as alfalfa and clover. The larvae of phytophagous pteromalids bore into developing seeds, consuming the endosperm and embryo. This feeding habit makes them particularly destructive, as the damage remains hidden until the adult insect emerges, leaving an exit hole in the seed coat.
The life cycle of these insects is characterized by complete metamorphosis. Adults typically emerge during the flowering period of host plants. Females deposit eggs into the developing seeds, where the entire larval development takes place. Once the pupal stage is completed inside the seed, the adult wasp cuts an exit hole, completing its generation cycle.
The economic impact of Pteromalidae as pests is severe in seed production regions. Infested seeds fail to germinate or produce weak seedlings, leading to significant stand failures and economic losses for farmers. Furthermore, infected batches may be rejected during seed quality testing, affecting marketability.
Effective management strategies rely on integrated pest management (IPM). Key tactics include:
- Early harvesting to prevent the emergence of adults
- Crop rotation to break the pest cycle
- Regular monitoring of seed fields during critical growth stages
- Targeted use of insecticides if thresholds are exceeded