Dasiops

Adults of Dasiops can be distinguished from the related genus Neosilba by genitalic and wing venation characters; precise identification to species requires examination of male terminalia. Larvae are internal feeders within plant tissues and cannot be reliably distinguished from other Lonchaeidae without molecular or rearing-based identification. Species-level identification of adults is challenging and typically requires taxonomic expertise.

Primarily associated with Passifloraceae in agricultural and natural settings. In cultivated systems, found in passionfruit orchards including yellow passionfruit, sweet granadilla, banana passionfruit, and purple passionfruit. In natural settings, associated with wild Passiflora species. One species (D. caustonae) has been studied in Andean forest and Venezuelan field sites. D. saltans has been documented in pitahaya cultivation in northern Peru.

Neotropical distribution with records from Colombia (Cundinamarca, Boyacá, Valle del Cauca), Brazil (Ceará and six other states), Peru (Pasco, Amazonas), and Uruguay. D. caustonae has been recorded in Venezuela and Hawaii (as candidate biocontrol agent). GBIF records indicate presence in Denmark, Norway, and Sweden, though these likely represent non-native occurrences or data artifacts given the primarily Neotropical native range.

Larvae are herbivores feeding internally on flower buds and unripe fruit of Passiflora species. Specific host associations documented include Passiflora edulis f. flavicarpa (yellow passionfruit), P. ligularis (sweet granadilla), P. edulis (purple passionfruit), and P. tripartita var. mollissima (banana passionfruit). D. caustonae is restricted to species in subgenus Tacsonia.

• Passiflora edulis f. flavicarpa - larval host (flower buds, fruit)yellow passionfruit
• Passiflora ligularis - larval host (flower buds, unripe fruit)sweet granadilla
• Passiflora edulis - larval hostpurple passionfruit
• Passiflora tripartita var. mollissima - larval hostbanana passionfruit
• Passiflora mollissima - hosttarget weed for D. caustonae biocontrol in Hawaii

Complete metamorphosis with egg, larval, pupal, and adult stages. D. inedulis completes life cycle in approximately 22.8 days under laboratory conditions. Adult longevity in field conditions (5.9 days) exceeds laboratory longevity by approximately fourfold. Sex ratio is 1:1. Life cycle is related to bud development phenology. Pupation occurs with pupae exposed at ground level in some species. D. caustonae is multivoltine with estimated life cycle length of 3-4 months.

Female D. caustonae appear to mark flowers with an oviposition deterrent pheromone after egg-laying, possibly the first report of such marking behavior outside Tephritidae. Larvae develop internally within flower buds and fruits, causing premature abscission. Adults have been observed to survive despite intensive chemical control programs.

Major economic pest of cultivated Passiflora crops, with infestation rates reaching 21-65% in some regions and fruit damage exceeding 50% in production losses. Serves as host for diverse hymenopterous parasitoids including larval parasitoids (Aganaspis pelleranoi, Microcrasis sp., Utetes anastrephae, Opius spp.) and pupal parasitoids (Pentapria sp., Trichopria sp., Pachycrepoideus vindemmiae, Spalangia sp., Coptera sp.). Pentapria sp. is an idiobiont of Dasiops pupae with wide geographical distribution. In natural ecosystems, D. caustonae has been investigated for biological control of invasive Passiflora mollissima, though survival is limited by premature flower fall, drought, and interspecific competition from Pyrausta perelegans (Lepidoptera).

Significant agricultural pest requiring integrated pest management strategies. Control measures include collection and destruction of infested flower buds and fruits to truncate life cycles, use of toxic baits based on Saccharopolyspora spinosa, and biological control through conservation of natural enemies. Monitoring employs McPhail traps baited with hydrolyzed protein. Trapping has been demonstrated to be equally effective as chemical treatment in some studies. D. caustonae has been evaluated as a potential biocontrol agent for invasive banana passionfruit in Hawaiian rainforests.

• NeosilbaRelated genus of Lonchaeidae also associated with Passifloraceae; distinguished by genitalic and wing venation characters, though larvae are difficult to separate without rearing or molecular methods
• AnastrephaTephritid fruit flies that also infest passionfruit; distinguished by family-level characters including wing patterns and larval morphology, though both cause similar fruit damage symptoms

• agricultural pest
• passionfruit
• flower bud fly
• lance fly
• biological control
• integrated pest management
• parasitoid host
• Neotropical

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Hymenopterous parasitoids of Dasiops (Díptera: Lonchaeidae) infesting cultivated Passiflora spp. (Passifloraceae) in Cundinamarca and Boyaca, Colombia
• First Record of the Flower Bud Fly Dasiops inedulis Steyskal, 1980 (Diptera: Lonchaeidae) in Northeastern Brazil
• Parasitoids of Dasiops (Diptera: Lonchaeidae) in sweet granadilla orchards in an Andean forest of Peru
• First Report ofNeosilba pradoiandDasiops frieseni(Diptera: Lonchaeidae) in Cultivated and Wild Hosts in Uruguay
• Manejo integrado de plagas como estrategia para el control de la mosca del botón floral del maracuyá Dasiops inedulis Steyskal (Diptera: Lonchaeidae)
• Biología de la Mosca de Los Botones Florales Del Maracuyá Dasiops Inedulis (Díptera: Lonchaeidae) En El Valle Del Cauca
• Field observations on the biology and behaviour of Dasiops caustonae Norrbom and McAlpine (Dipt., Lonchaeidae), as a candidate biocontrol agent of Passiflora mollissima in Hawaii
• Fruitflies of the Genus Dasiops (Diptera: Lonchaeidae) Associated With Banana Passionfruit And General Recommendations For Their Agroecological Management In Vereda CaÑÓN, Municipio de SutamarchÁN - BoyacÁ
• Current and Future Potential Distribution of the Flower Bud Fly (Dasiops saltans) in Pitahaya Cultivation in Northern Peru Under Climate Change Scenarios