Toumeyella

Toumeyella species are distinguished from other soft scales by their highly convex, tortoise-like female coverings and association with conifers or magnoliaceous hosts. Specific identification requires examination of microscopic features including duct distribution, setae arrangement, and body shape. T. liriodendri females reach peppercorn size (approximately 6 mm); T. pini females are similarly convex with striped patterning. Males are smaller, elongate, and develop on needles rather than twigs.

Forests, seed orchards, and ornamental landscapes; primarily associated with host trees including pines (Pinus spp.), tuliptree (Liriodendron tulipifera), and magnolias. Crawlers initially settle on leaf undersides or new growth before migrating to twigs.

Native to North America; various species have been introduced or spread to Europe (T. parvicornis in Italy, France), Colombia (T. coffeae), and other regions. Individual species show distinct ranges: T. liriodendri occurs where tuliptree grows; T. pini ranges east of the Rocky Mountains with recent expansion to Colorado; T. parvicornis is invasive in Mediterranean Europe.

Varies by species and latitude. T. pini has 1–3 generations annually: crawlers emerge late May–early June, mid-July–early August, and late October–early November in Georgia. T. liriodendri has one generation per year with overwintering fertilized females, spring ovisac production, and crawler emergence June–July.

Phloem sap extracted from host plants using piercing-sucking mouthparts. Excess fluid excreted as honeydew.

• Liriodendron tulipifera - primary hosttuliptree scale (T. liriodendri)
• Pinus taeda - hostloblolly pine for T. pini
• Pinus spp. - hostmultiple pine species for T. pini, T. parvicornis, T. numismaticum
• Magnoliaceae - host familytuliptree scale and relatives
• Myrtillocactus geometrizans - hostarborescent cactus host for T. martinezae in Mexico

Sexual and parthenogenetic reproduction occurs; T. liriodendri reproduces primarily by thelytokous parthenogenesis with rare males. Females are oviparous (T. liriodendri) or ovoviviparous/larviparous (T. pini produces crawlers directly). Development includes egg, crawler (mobile first instar), sessile nymphal instars, and adult stages. Females remain sedentary after initial settlement; males develop wings and fly to mate. Overwintering stage varies: fertilized females (T. liriodendri), immature females (T. pini).

Crawlers are the only mobile stage, dispersing to new growth or host trees via wind, insects, birds, mammals, or human activity. Adults are permanently attached to host plant. Heavy honeydew production attracts ants, wasps, bees, and flies; facilitates sooty mold growth on host plant surfaces.

Phloem-feeding herbivores that reduce host tree vigor through nutrient extraction; heavy infestations cause branch dieback or tree death. Honeydew production supports ant mutualisms and broader insect communities. Serve as prey for specialized predators (lady beetles, lacewing larvae, pyralid moth larvae) and parasitoid wasps. Invasive populations (T. parvicornis) alter fire behavior in Mediterranean pine forests.

Several species are economically significant pests: T. liriodendri damages ornamental tuliptrees and magnolias; T. pini affects pine seed orchards and Christmas tree plantations; T. parvicornis threatens stone pine (Pinus pinea) forests and urban parks in Europe. Management includes pruning, insecticide applications, and biological control using predators (Exochomus quadripustulatus) and parasitoids (Coccophagus lycimnia, Metaphycus spp.).

• ParthenolecaniumBoth are soft scale genera with convex female coverings; Toumeyella distinguished by association with conifers/Magnoliaceae and specific duct patterns
• CoccusLarger soft scales with different host ranges and body morphology; Toumeyella females more tortoise-shaped
• Chionaspis (pine needle scale)Armored scale (Diaspididae) with separable waxy cover; often co-occurs with Toumeyella on pines but belongs to different family with distinct biology

• scale insects
• soft scales
• Coccidae
• forest pests
• ornamental pests
• honeydew producers
• ant mutualisms
• biological control
• invasive species
• phloem feeders

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Encyrtid Holdings | Entomology Research Museum
• There's a sucker born everday - Tuliptree scale, Toumeyella Iiriodendri — Bug of the Week
• Bug Eric: Striped Pine Scale
• Green Tree Ant Sister Act: Oecophylla smaragdina — Bug of the Week
• Archive — Bug of the Week
• Toumeyella parvicornis . [Distribution map].
• Tuliptree Scale Toumeyella liriodendri (Gmelin) (Insecta: Hemiptera: Coccoidea: Coccidae)
• Biology of the Tuliptree Scale, Toumeyella liriodendri (Homoptera: Coccidae)
• Genome report: Genome sequence of the tuliptree scale insect, Toumeyella liriodendri (Gmelin)
• Genome report: Genome sequence of tuliptree scale, Toumeyella liriodendri (Gmelin), an ornamental pest insect
• The Amino Acids and Sugars in Honeydew of the Tuliptree Scale, Toumeyella liriodendri, and in the Sap of Its Host, Yellow-Poplar
• Outbreaks of invasive phloem feeding Toumeyella parvicornis modified fire behaviour and canopy surface reflectance in Mediterranean Pinus pinea forests
• Some Aspects of the Biology and Dispersal of the Pine Tortoise Scale, Toumeyella numismaticum (Pettit and McDaniel) (Homoptera: Coccidae)
• THE LIFE HISTORY OF TOUMEYELLA PINI (KING) (HOMOPTERA: COCCIDAE) IN LOBLOLLY PINE SEED ORCHARDS IN GEORGIA
• “Alien versus predator”: predatory effect of coccinellid Exochomus quadripustulatus on the scale insect Toumeyella parvicornis . An open‐field experimentation on the Pinus pinea of Rome
• Host Plants of Toumeyella Coffeae And Puto Barberi (Hemiptera) In Coffee Agroecosystems Of Norte de Santander, Colombia
• Effects of Parasitism on the Population Growth of Toumeyella martinezae (Coccidae) in the Presence of Its Mutualistic Ant Liometopum apiculatum (Formicidae) in an Arid Region of Central Mexico
• Using Species Distribution Models (SDMs) to Estimate the Suitability of European Mediterranean Non-Native Area for the Establishment of Toumeyella Parvicornis (Hemiptera: Coccidae)
• Development of an LNA-Based qPCR Assay for Detecting Toumeyella parvicornis (Cockerell, 1897) (Hemiptera: Coccidae) from Insect and Honeydew DNA.
• "The Last of Them": Entomopathogenic Effect of Akanthomyces muscarius on the Scale Insect Pest Toumeyella parvicornis Under Laboratory Conditions, a Potential Biological Control Candidate.
• Fisher-Shannon Analysis of Sentinel 1 Time Series from 2015 to 2023: Revealing the Impact of Toumeyella Parvicornis Infection in a Pilot Site of Central Italy.