Encyrtinae

Habitats correspond to host availability: agricultural fields, forest ecosystems, urban domestic environments, and vegetation supporting herbivorous host insects. Laboratory rearing successful at 25–27°C, 60–82% humidity, 16L:8D photoperiod with honey provided as adult food.

Worldwide distribution. Documented occurrences include: North America (Alabama, Florida with unique haplotype), Europe (new records for Comperia merceti), Central America (passion vine ecosystems), Japan, China, Mexico, Israel, Australasia, and Macaronesia.

Adults feed on honeydew and nectar; laboratory rearing uses honey ad libitum. Larvae are endoparasitoids developing within host eggs or immature stages.

• Megacopta cribraria (bean plataspid, Hemiptera: Plataspidae) - primary host for Ooencyrtus nezaraeInvasive pest of leguminous crops in southeastern United States
• Domestic cockroaches (Blattodea) - host for Comperia mercetiUrban biological control agent in Europe
• Ticks (Ixodidae) - host for Ixodiphagus speciesAustralasian species show potential novel host switches
• Heliconiini butterflies (Lepidoptera: Nymphalidae) - host for Ooencyrtus marcelloiEggs on passion vines (Passifloraceae) in Central America
• Whiteflies (Hemiptera: Aleyrodidae) - host for Metaphycus speciesNeotropical region
• Scale insects (Hemiptera: Coccoidea) - host for multiple generaCeroplastes rubens and other Coccidae in Japan
• Psyllids (Hemiptera: Psyllidae) - host for PsyllaephagusGenus specialized on psyllid parasitism

Development includes egg, larval, and pupal stages within host. Ooencyrtus nezarae: adult emergence 14 days post-exposure at 25–27°C, with emergence continuing over several days. Two generations observed in laboratory rearing. Some species can develop in frozen host eggs stored 6–14 months.

Fortuitous biological control introductions documented: Ooencyrtus nezarae arrived in North America without regulatory approval, with Alabama and Florida populations showing 1.3% COI sequence divergence suggesting separate introduction events. High laboratory parasitism rates observed (66.2% in second generation). Female-biased sex ratios common (~0.62 proportion female). Adults require carbohydrate food sources for survival and reproduction.

Important biological control agents of agricultural pests (pentatomoid bugs, whiteflies, scale insects, psyllids) and urban pests (cockroaches). Part of adventive parasitoid communities that suppress invasive herbivore populations. Ixodiphagus species may regulate tick populations in Australasian ecosystems.

Deployed and adventive biological control agents for crop protection and urban pest management. Ooencyrtus nezarae controls Megacopta cribraria, an invasive pest of soybean and other legumes. Comperia merceti used against domestic cockroaches. Molecular barcoding (COI) used to track population origins and introduction pathways. Laboratory rearing protocols established for mass propagation.

• TetracneminaeAlso within Encyrtidae; distinguished by antennal structure and wing venation patterns, though reliable separation often requires microscopic examination
• CopidosomatinaeEncyrtid subfamily with polyembryonic development; Encyrtinae typically produce single offspring per host egg
• ScelionidaeEgg parasitoids of similar size and habitus; distinguished by wing venation, mesosomal structure, and lack of metallic coloration common in many Encyrtinae

• parasitoid
• biological control
• egg parasitoid
• Chalcidoidea
• agricultural pest management

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• A fortuitous find: a unique haplotype of Ooencyrtus nezarae Ishii (Encyrtidae: Encyrtinae) discovered in Florida
• Molecular characterisation of Australasian Ixodiphagus (Hymenoptera; Encyrtidae; Encyrtinae) reveals unexpected diversity and a potential novel host switch
• New Distributional Records ofComperia merceti(Compere, 1938) (Hymenoptera: Chalcidoidea; Encyrtidae; Encyrtinae), a Natural Enemy of Domestic Cockroaches, in Europe
• Descriptions and Biology of New or little known Coccids from Japan; Observations on the Hymenopterous Parasites of Ceroplastes rubens Mask., with Descriptions of New Genera and Species of the Subfamily Encyrtinae . By Tei Ishii (Dept. Agr. and Comm. Japan, Imp. Plant Quar. Sta., Bull. 3, Aug. 1923, p. 1-68, pl. I-XIV, fig. 1-5 (Art. I.) and pp. 69-114, pl. XV-XIX (Art. II.).
• Descriptions and Biology of New or little known Coccids from Japan; Observations on the Hymenopterous Parasites of Ceroplastes rubens Mask., with Descriptions of New Genera and Species of the Subfamily Encyrtinae . By Tei Ishii (Dept. Agr. and Comm. Japan, Imp. Plant Quar. Sta., Bull. 3, Aug. 1923, p. 1-68, pl. I-XIV, fig. 1-5 (Art. I.) and pp. 69-114, pl. XV-XIX (Art. II.).