Glossonotus crataegi

Glossonotus crataegi can be distinguished from other North American treehoppers by the combination of: (1) the elevated, keeled pronotum with a posteriorly extended process that is not laterally compressed into a horn-like structure (as in some other telamonine genera); (2) the greenish-yellow base coloration with variable dark markings; (3) association with Rosaceae host plants, particularly Crataegus and Cydonia. It differs from the closely related genus Telamona by pronotal shape—Glossonotus has a more rounded, keeled crest rather than the angular or horned projections seen in many Telamona species. Examination of the male genitalia may be required for definitive species-level identification within Glossonotus.

Associated with deciduous woodlands, forest edges, orchards, and hedgerows where host plants in the Rosaceae family occur. Found particularly in areas with hawthorn thickets and quince plantings. The species utilizes the woody vegetation of its host plants for feeding, oviposition, and shelter.

Documented from eastern and midwestern North American states including Connecticut, Delaware, Illinois, Iowa, and Maine. The distribution corresponds with the range of its primary host plants in the Rosaceae family.

Adults are active during the growing season when host plants are in leaf; specific phenology data are limited but activity likely peaks in late spring through summer corresponding with host plant development.

Phloem-feeding on host plants, specifically extracting sap from vascular tissues of Crataegus (hawthorn) and Cydonia (quince) species. The piercing-sucking mouthparts are adapted for accessing plant phloem.

• Crataegus - primary host plantHawthorn species; primary host reflected in specific epithet 'crataegi'
• Cydonia - host plantQuince; source of common name 'Quince Treehopper'

Incomplete metamorphosis with egg, nymph, and adult stages. Eggs are inserted into host plant tissue, likely stems or leaf veins. Nymphs feed on host plant phloem and develop through multiple instars before maturing to adults. Detailed life cycle studies specific to this species have not been published.

Adults and nymphs are sedentary, remaining on host plant stems and foliage. The enlarged pronotum likely serves as camouflage, breaking up the body outline against vegetation. When disturbed, individuals may move to the opposite side of stems or drop from the plant. The species is not known to be gregarious in dense aggregations, though multiple individuals may occur on suitable host plants.

As a phloem-feeding herbivore, contributes to nutrient cycling and serves as a food source for predators and parasitoids. The species may have minor impacts on host plant health through sap extraction, but is not considered a significant pest. Specific parasitoid or predator associations have not been documented for G. crataegi specifically.

Minor potential pest of quince in orchard settings, though economic impact appears limited. The common name 'Quince Treehopper' reflects historical association with Cydonia cultivation. Not known to vector plant pathogens. Primarily of ecological and taxonomic interest rather than agricultural significance.

• TelamonaRelated genus in tribe Telamonini with enlarged pronota; Telamona species typically have more angular, compressed, or horn-like pronotal projections rather than the rounded, keeled crest of Glossonotus
• Glossonotus acutusCongeneric species with similar overall morphology; distinguished by details of pronotal shape and male genitalia structure
• Entylia carinataAnother smiliine treehopper with keeled pronotum, but with different pronotal proportions and host plant associations (typically Asteraceae)

• treehopper
• Membracidae
• phloem-feeder
• Rosaceae associate
• North American native

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Publications | Entomology Research Museum