Liorhyssus

Stål, 1870

scentless plant bugs

Species Guides

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Liorhyssus is a of scentless plant bugs in the Rhopalidae, Rhopalinae. The genus contains at least 12 described distributed across multiple continents. The most widely studied species, Liorhyssus hyalinus, has emerged as an agricultural pest of quinoa when the crop is cultivated outside its native Andean region, particularly in coastal Peru. Members of this genus feed on developing seeds and grains using .

Liorhyssus by (c) Slimguy, some rights reserved (CC BY). Used under a CC-BY license.Liorhyssus by (c) Iwan Van Hoogmoed, some rights reserved (CC BY). Used under a CC-BY license.Liorhyssus by (c) Slimguy, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Liorhyssus: //laɪ.oʊˈrɪsəs//

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Distribution

Records exist from Southern Africa, British Columbia, India, Jawa, and Manitoba. The well-documented Liorhyssus hyalinus occurs in South America (Argentina, Chile, Colombia, Ecuador, Paraguay, Peru, Venezuela), the western United States, and has expanded to non-Andean regions at lower elevations in Bolivia and Peru.

Host Associations

  • Chenopodium quinoa - pestCauses serious damage at grain filling stage, particularly in coastal Peru and as part of pest complex in Argentina and Chile
  • Zea mays - alternative Used as laboratory food source; milky stage grains support development and
  • Sonchus oleraceus - Recorded from La Pampa, Argentina

Life Cycle

Liorhyssus hyalinus has five nymphal instars (I–V) before adulthood. and nymphal development are temperature-dependent, with successful nymphal development failing at 18°C. Total nymphal time decreases as temperature increases from 22°C to 36°C. Lower developmental threshold estimated at 16.0°C for eggs and 17.9°C for nymphs.

Ecological Role

Liorhyssus hyalinus functions as an agricultural pest in expanded quinoa areas, causing economic damage in Argentina, Chile, and coastal Peru. It is part of a broader complex of phytophagous insects exploiting quinoa grown outside its native Andean range.

Human Relevance

Liorhyssus hyalinus has become an important pest of quinoa in South America when the crop is grown at lower elevations outside its Andean origin. It causes serious problems at the coastal level of Peru and contributes to economic losses in Argentina and Chile. Laboratory studies use this as a model for thermal research on heteropteran pests.

Similar Taxa

  • Nysius simulansCo-occurs as quinoa pest; distinguished by soil-dwelling habit in N. simulans versus above-ground habit in Liorhyssus hyalinus

More Details

Thermal biology

Development and in Liorhyssus hyalinus are strongly temperature-dependent. Optimal temperature is 30°C for both development and reproduction. Preoviposition time decreases with increasing temperature, while oviposition period is longest at 26°C. longevity is higher at 22–26°C than at 30–34°C. Peak densities are expected in warm areas and seasons.

Species diversity

The contains at least 12 described : L. eckerleini, L. finitoris, L. flavomaculatus, L. hessei, L. hyalinus, L. kaltenbachi, L. lineatoventris, L. natalensis, L. pararubricosus, L. rubicundus, L. rubricosus, and L. slateri.

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