Chlorochroa

Different species of Chlorochroa are morphologically very similar and difficult to distinguish based on external features alone. Reliable identification requires examination of male genitalia structure. Geographic distribution provides secondary supporting evidence for species determination. The combination of the pale marginal band, triangular scutellum with possible basal bumps, and overall body shape helps distinguish Chlorochroa from other Pentatomidae genera.

Adults are broadly oval, 8-19 mm long. Coloration varies from green to brownish or almost black, with a characteristic pale red, yellow, or whitish margin around the body excluding the head. The scutellum is long and triangular, sometimes with three bumps along the base, and the tip is usually paler than the rest. The forewing membrane is often translucent. Nymphs are mostly black with a yellow/white margin around the body excluding the head, similar to adults. Some species exhibit geographic color variation, being darker in southern populations and greener in northern populations.

Inland saline wetlands, agricultural areas, and natural vegetation zones. Specific species occupy distinct habitats: C. belfragii and C. faceta occur in inland saline wetlands of the western United States; other species are found in diverse habitats including juniper/oak/pinyon woodlands, sand dune areas, and agricultural landscapes.

Europe and North America. In North America, species occur across the western United States including Wyoming, Colorado, New Mexico, Texas, and adjacent regions. Some species have more restricted ranges, such as C. belfragii and C. faceta in western saline wetlands.

Activity patterns vary by species and latitude. Adults are active during growing seasons when host plants are available. Specific seasonal data for most species is limited, but activity generally coincides with host plant flowering and fruiting periods.

Phytophagous; feeds on a wide range of plants including apple, cotton, grape, English holly, Himalayan blackberry, hawthorn, arborvitae, groundsel, clover, alfalfa, cocklebur, and various grasses. Specific documented host grasses for C. belfragii and C. faceta include Distichlis spicata (saltgrass), Puccinellia nuttalliana (Nuttall's alkali grass), and Leymus cinereus (basin wildrye for C. belfragii).

• Distichlis spicata - host plantsaltgrass; documented for C. belfragii and C. faceta
• Puccinellia nuttalliana - host plantNuttall's alkali grass; documented for C. belfragii and C. faceta
• Leymus cinereus - host plantbasin wildrye; documented for C. belfragii only
• Malus domestica - host plantapple
• Gossypium spp. - host plantcotton
• Vitis spp. - host plantgrape
• Ilex aquifolium - host plantEnglish holly
• Rubus armeniacus - host plantHimalayan blackberry
• Crataegus spp. - host planthawthorn
• Thuja occidentalis - host plantarborvitae
• Senecio spp. - host plantgroundsel
• Trifolium spp. - host plantclover
• Medicago sativa - host plantalfalfa
• Xanthium strumarium - host plantcocklebur
• Prosopis glandulosa - host planthoney mesquite; documented for C. ligata

The life cycle consists of three stages: egg, nymph, and adult. There are five nymphal instars. Developmental timing varies with temperature and host plant availability. Under favorable conditions, multiple generations may occur annually.

Adults and nymphs feed by piercing plant tissues with their mouthparts and sucking sap. When disturbed, they may release defensive secretions characteristic of stink bugs. Some species are attracted to lights at night. Mating pairs have been observed on host plant seedpods.

Herbivores that feed on native and cultivated plants. Some species are significant agricultural pests. They serve as prey for various predators including predatory wasps such as Astata unicolor, which has been documented paralyzing Chlorochroa ligata to provision nests.

Several species are agricultural pests causing damage to fruits, vegetables, and field crops. C. ligata (conchuela bug) is a notable pest in the Coastal Bend region of Texas, affecting alfalfa, corn, cotton, peppers, sorghum, and tomatoes. The genus has been studied for chemical ecology, with research identifying compounds in metathoracic glands and dorsal abdominal glands. No species are currently used for biological control.

• Nezara viridulaSouthern green stink bug; similar shield shape but lacks pale marginal band and has different coloration pattern
• Chinavia hilarisGreen stink bug; similar size and general form but lacks the characteristic marginal coloration of Chlorochroa
• Halyomorpha halysBrown marmorated stink bug; invasive species with different color pattern and white banding on antennae

• Pentatomidae
• phytophagous
• agricultural pest
• North America
• Europe
• shield bug
• stink bug

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Soybean Insects: Late-Season Pests (R1 to R7) - AgriLife Extension Entomology
• Insects that feed on developing grain in the head - AgriLife Extension Entomology
• Publications | Entomology Research Museum
• Oregon Researchers Find a Native Wasp With a Taste for Stink Bugs
• Mantispidae | Beetles In The Bush
• July | 2024 | Beetles In The Bush
• Characterization of mycobiont adaptations in the foliose lichen Xanthoparmelia chlorochroa (Parmeliaceae)
• Analysis of Salazinic, Norstictic, and Usnic Acids in Xanthoparmelia chlorochroa by Ultra-Performance Liquid Chromatography/Tandem Mass Spectrometry
• Host Grasses of the Little-Known Stink Bugs Chlorochroa (Rhytidolomia) belfragii (Stål) and C. (R.) faceta (Say) (Hemiptera: Pentatomidae) in Inland Saline Wetlands
• Experimental Reproduction of Tumbleweed Shield Lichen (Xanthoparmelia Chlorochroa) Poisoning in a Domestic Sheep Model