Lygus elisus

Van Duzee, 1914

pale legume bug, lucerne plant bug

Lygus elisus is a plant bug in the Miridae, commonly known as the pale legume or lucerne plant bug. It is a significant agricultural pest of forage, fiber, and fruit crops, particularly alfalfa, cotton, and strawberries. The species is distributed across western North America from Alaska to northern Mexico, with established also reported in Oceania. and nymphs feed on developing plant tissues using , causing economic damage including cat-faced berries in strawberry production. Female-produced have been identified and developed for monitoring and potential management applications.

Lygus elisus by (c) Elliott Gordon, some rights reserved (CC BY), uploaded by Elliott Gordon. Used under a CC-BY license.

Pronunciation

How to pronounce Lygus elisus: /ˈlaɪɡəs ɛˈliːsəs/

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Identification

are small plant bugs approximately 5-6 mm in length. The can be distinguished from other Lygus species by male genitalia characteristics; adult males are illustrated in taxonomic keys. General Lygus includes a conspicuous dark-colored triangle in the center of the back (the scutellum), with body coloration varying from pale green to yellowish brown with reddish brown to black markings. Nymphs are uniformly pale green with red-tipped ; late instars have four conspicuous black spots on the and one large black spot near the base of the . Accurate species-level identification requires examination of male genitalia or molecular methods.

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Habitat

Agricultural crop systems including alfalfa fields, cotton fields, and strawberry production systems. Also found in native vegetation adjacent to agricultural areas. The thrives in environments with abundant plants providing succulent growth.

Distribution

Western North America: Alaska, western Canada (British Columbia, Alberta), western United States (California, Arizona, Idaho, Nevada, Washington), and northern Mexico. Also established in Oceania. GBIF records confirm presence in these regions.

Diet

Both nymphal and stages feed on plants using . Documented crop hosts include alfalfa (forage), cotton (fiber), and strawberries (fruit). In laboratory colonies, reared on green bean pods (Phaseolus vulgaris), of navel orangeworm (Amyelois transitella), and raw sunflower seeds.

Host Associations

alfalfa - primary crop forage crop
cotton - primary crop fiber crop
strawberry - primary crop fruit crop; feeding causes cat-faced berries
green bean - laboratory Phaseolus vulgaris; used for rearing
navel orangeworm - laboratory diet component of Amyelois transitella used in colony maintenance
sunflower - laboratory diet componentraw seeds used in colony maintenance

Life Cycle

Development is temperature-dependent. to development ranges from 37.6 days at 15°C to 11.1 days at 30°C. Five nymphal instars. Lower developmental threshold estimated at 10.6°C, upper threshold at 34.5°C; no survival to adulthood at 35°C. Preoviposition period averages 8.3 days at 25°C. Mean highest at 25°C (128.8 eggs per female). Eggs laid in plant tissues such as green bean pods in laboratory conditions.

Behavior

disperse within and among different plants searching for new nutritional resources. Males are attracted to female-produced . Both nymphs and adults are active feeders, causing characteristic damage to developing plant tissues. Reproductively active under long-day conditions (18:6 h L:D).

Ecological Role

Agricultural pest causing economic damage to forage, fiber, and fruit crops. Feeding damage reduces crop quality and yield, particularly in strawberry production where it causes unmarketable cat-faced fruit. Serves as prey for including Geocoris (bigeyed bugs) in agricultural systems.

Human Relevance

Major economic pest of high-value agricultural crops. Management relies on strategies including monitoring with traps, , and judicious use. Pheromone-based monitoring uses a 100:60 blend of (E)-2-hexenyl butyrate and (E)-4-oxo-2-hexenal. has been reported, complicating chemical control. Subject of simulation modeling for optimizing pest management strategies.

Similar Taxa

Lygus hesperusWestern tarnished plant bug; co-occurs in western North America, similar appearance, , and damage profile. Distinguished by male genitalia and composition.
Lygus lineolarisTarnished plant bug; eastern North American counterpart with overlapping and pest status. Geographic separation is primary distinguishing feature.
Lygus nubilusPreviously confused due to taxonomic synonymies; distinguished by male genitalia characteristics in taxonomic keys.