Closterotomus

Adults of C. norvegicus can be distinguished from similar lygus bugs by two dark spots on the prothorax; lygus bugs possess a colored triangular scutellum where the wings attach. Nymphs are green, becoming reddish-brown in adulthood in C. norvegicus. Size ranges 6–8 mm in C. norvegicus.

Agricultural landscapes including olive orchards, citrus orchards, lucerne fields, and associated weedy vegetation. Non-crop host plants include Mercurialis annua, Urtica spp., Parietaria spp., and Sinapis alba, which serve as reservoir habitats.

Palearctic region and North America. Specific records from Denmark, Norway, Sweden, and Vermont, USA. C. trivialis documented in Crete and mainland Greece; C. norvegicus native to Europe, introduced to New Zealand and California, USA.

C. trivialis active from January through May in Crete, with nymphal instars appearing mid-January and adults first recorded early March. Adult emergence timing varies by habitat type, with 13-day lag observed between citrus and olive orchard populations.

Phytophagous, feeding on plant sap from flowers, buds, and unripe fruit. Documented hosts include Olea europaea (olive), Citrus sinensis (sweet orange), Mercurialis annua, Urtica spp., Parietaria spp., Sinapis alba, potato, carrot, clover, and cannabis. Nutritional suitability varies by host; Mercurialis annua, Sinapis alba, and Citrus sinensis support better development and longevity than Urtica urens, Parietaria diffusa, or Olea europaea.

• Olea europaea - crop hostKoroneiki cultivar; lower suitability, higher mortality
• Citrus sinensis - crop hostWashington Navel cultivar; supports good adult longevity
• Mercurialis annua - non-crop hoststrongly preferred, optimal developmental threshold (3.30°C)
• Urtica urens - non-crop hostdevelopment fails at 15°C and 20°C, higher mortality
• Parietaria diffusa - non-crop hostless suitable, highest developmental threshold (10.7°C)
• Sinapis alba - non-crop hostsupports good survival and longevity

Hemimetabolous development with egg, nymph, and adult stages. Nymphal development temperature-dependent; optimal at 24°C where host plant effects on development rate are minimal. At suboptimal temperatures (15, 20, 27°C), host plant significantly affects development duration. Lower temperature developmental threshold varies by host: 3.30°C on Mercurialis annua to 10.7°C on Parietaria diffusa.

Strong host plant preference hierarchy observed, with weeds preferred over crop plants. Movement occurs among crop and non-crop host plants. Feeding concentrated on reproductive structures (flowers, buds, unripe fruit).

Agricultural pest on major crops; population density typically higher on non-crop weed hosts than on crop plants. Serves as host for parasitoids including Peristenus closterotomae, which may contribute to biological control. Non-crop hosts act as reservoirs maintaining populations that move into crops.

Economic pest of olive, citrus, lucerne, white clover, lotus seed, and pistachio crops. C. norvegicus introduced to New Zealand and California where it damages seed crops. Subject of integrated pest management research; biological control potential explored using European parasitoids.

• Lygus spp.Same family (Miridae), similar size and general appearance; distinguished by lygus having colored triangular scutellum versus Closterotomus having two prothoracic spots
• Calocoris spp.Closely related genus; C. trivialis historically classified as Calocoris trivialis, indicating taxonomic proximity and similar morphology

• Miridae
• plant bug
• agricultural pest
• olive pest
• citrus pest
• potato capsid
• phytophagous
• Palearctic
• North America
• biological control

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bug Squad
• Bug Squad
• Fancy Meeting You Here, Mr. Potato Capsid | Bug Squad
• One Potato...Two Potato... | Bug Squad
• Life history of Closterotomus (Calocoris) trivialis (Costa) (Heteroptera: Miridae) in olive and citrus orchards in Crete
• Effect of host plant species and temperature on the development and survival of the plant bug Closterotomus trivialis (Costa) (Hemiptera: Miridae)
• Seasonal phenology and relative preference of Closterotomus (Calocoris) trivialis (Hemiptera: Miridae) on olive, citrus and associated host plants in the field
• Potential for classical biological control of the potato bug Closterotomus norwegicus (Hemiptera: Miridae): description, parasitism and host specificity of Peristenus closterotomae sp. n. (Hymenoptera: Braconidae)
• The genome sequence of the mirid plant bug, Closterotomus trivialis (A.Costa, 1853) (Hemiptera: Miridae).