Hexamermis; Chaetogena obliquata; Tryphera lugubris; Cotesia plutellae; Glyptapanteles compressiventris; Meteorus versicolor; CONTROL-OF; Ocnogyna baetica (Lepidoptera); LEPIDOPTERAN-HOSTS; Ocnogyna baetica; New host record; SPAIN-; South, Badajoz & Cordoba provinces; New lepidopteran host record, prevalence & control potential Ocnogyna baetica; BIOLOGICAL-CONTROL; Natural pathogen/parasite records & control potential; NEMATODE-PARASITES; Hexamermis; DIPTERAN-PARASITES; Chaetogena obliquata & Tryphera lugubris; HYMENOPTERAN-PARASITES; Cotesia, Glyptapanteles & Meteorus; FUNGAL-DISEASES; Beauveria bassiana; VIRAL-DISEASES; Baculovirus & entomopoxvirus; New host record; SPAIN-; South, Badajoz & Cordoba provinces; Pathogen/parasite records, prevalence & control potential Populations of Ocnogyna baetica were sampled during 1989-92 in various provinces of Southern Spain for the presence of pathogen microorganisms, nematode and parasitic insects. A total number of 8615 larvae have been diagnosed among which the following biotic factors have been encountered and identified: viruses (Baculovirus sp., Entomopoxvirus sp.) fungus (Beauveria bassiana), mermithid (Hexamermis sp.), braconids (Cotesia plutellae, Glyptapanteles compressiventris, Meteorus versicolor), tachinids (Chaetogena obliquata. Tryphera lugubris). These pathogens and parasitoids represent new species that have not been reported in Spain or in O. baetica before. Data on their contribution to host mortality is presented. none