Litargus tetraspilotus

Distinguished from other Litargus species by the four-spotted pattern referenced in its species name. In Brazil, it represents one of only three recorded Mycetophagidae species. Identification to species level requires examination of genitalia and other subtle morphological characters; the Brazilian study provided complementary descriptions based on new characters not previously used.

Fruit tree orchards, particularly citrus plantings (Citrus nobilis, C. sinensis, C. limon, C. reticulata) and other fruit trees including Diospyros kaki, Prunus persica, and Prunus persica var. nucipersica. Associated with fungal growth on leaves, specifically powdery mildew infections.

Native to North America (Canada, United States); expanded range includes Mexico, Guatemala, Nicaragua, Panama, Argentina, and Brazil (first recorded in Ponta Grossa, Paraná state). GBIF records indicate presence in Manitoba, Canada and São Paulo state, Brazil.

In Paraná, Brazil, highest abundance occurs in spring and lowest in autumn. Activity correlated with rainfall and relative humidity, with significant variation between years.

Mycophagous; feeds on Oidium sp. (Ascomycota, Erysiphaceae), a powdery mildew fungus growing on fruit tree leaves.

• Oidium sp. - food sourcePowdery mildew fungus (Erysiphaceae) on Citrus limon and other citrus species
• Citrus nobilis - habitat/food substrateHost plant for Oidium sp. food source
• Citrus sinensis - habitat/food substrateHost plant for Oidium sp. food source
• Citrus limon - habitat/food substrateHost plant for Oidium sp. food source
• Citrus reticulata - habitat/food substrateHost plant for Oidium sp. food source
• Diospyros kaki - habitat/food substrateHost plant for Oidium sp. food source
• Prunus persica - habitat/food substrateHost plant for Oidium sp. food source
• Prunus persica var. nucipersica - habitat/food substrateHost plant for Oidium sp. food source

Laboratory rearing successful at 22.05±1.44°C and 55.68±10.70% relative humidity. Eggs laid on moistened filter paper with fungus-infected leaf pieces; larvae and pupae develop on same substrate. Specific duration periods for developmental stages were studied but values not provided in available excerpt.

Population abundance shows significant positive correlation with rainfall and relative humidity. Seasonal fluctuation observed with spring peaks and autumn lows. Nocturnal or cryptic habits typical of family inferred but not explicitly documented.

Mycophagous feeder that consumes powdery mildew fungi on fruit trees. Potential role as biological control agent for fungal plant pathogens, though this application has not been formally developed.

Potential biocontrol agent for powdery mildew diseases on citrus and other fruit crops. Presence in orchards indicates natural fungal control occurring, though deliberate use in pest management has not been reported.

• Other Litargus speciesRequire examination of genitalia and subtle morphological characters for separation; the four-spotted pattern may be diagnostic but confirmation needed
• Other MycetophagidaeShare hairy appearance and mycophagous habits; identification to genus and species requires specialist knowledge and microscopic examination

• mycophagous
• powdery mildew
• citrus pest
• biocontrol potential
• Neotropical expansion

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The first record of Litargus tetraspilotus (Coleoptera, Mycetophagidae) in Brazil, with biological notes and complementary description of the species