Toumeyella liriodendri

(Gmelin, 1790)

tuliptree scale

Toumeyella liriodendri, the tuliptree , is a () to North America and specialized on Liriodendron tulipifera (tuliptree or -poplar). This overwinters as second- on twigs, matures to in spring, and produces that hatch into in early summer. First-instar nymphs feed on leaf undersides before migrating back to twigs in autumn. Males are unknown; is presumed parthenogenetic. Heavy cause branch dieback, reduced growth, and production that supports growth. The species has been the subject of recent genomic research, with a 536Mb assembly revealing it as an early-diverging soft scale with 17 .

Toumeyella liriodendri by Gerald J. Lenhard, Louisiana State University, Bugwood.org - See more at: http://www.forestryimages.org/browse/detail.cfm?imgnum=0014284#sthash.Bx85jMxQ.dpuf. Used under a CC BY-SA 3.0 license.

Tuliptree Scale & Camponotus floridanus (51760914741) by Matt Borden. Used under a CC BY-SA 2.0 license.

Carpenter Ant Picnic (51761586379) by Matt Borden. Used under a CC BY-SA 2.0 license.

Pronunciation

How to pronounce Toumeyella liriodendri: //ˌtuː.maɪˈɛl.lə ˌlɪr.i.oʊˈdɛn.dri//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

females are immobile, oval to hemispherical approximately 5-6 mm in diameter at maturity—about the size of a peppercorn. The body is covered by a soft, flexible rather than a hard armor. Coloration ranges from to reddish-brown. Second- are smaller and darker. First-instar are tiny (approximately 0.5 mm), black, and mobile, dispersing to leaf undersides. The is distinguished from other by its exclusive association with Liriodendron tulipifera, its with seasonal between twigs and leaves, and the absence of males. Unlike (), the body covering is soft and non-separable from the . Heavy produce conspicuous blackening of bark from growing on accumulated .

Images

Habitat

Deciduous forests and urban landscapes where the tree Liriodendron tulipifera (tuliptree or -poplar) occurs. Within host trees, occupies two distinct microhabitats seasonally: twigs and branches for second- and females, and leaf undersides for first-instar during summer feeding.

Distribution

to eastern North America, following the range of its tree Liriodendron tulipifera. Documented from the United States and Canada. Specific study have been characterized in Maryland, USA.

Seasonality

(one per year). : second- on twigs (October–March). Spring activity resumption: April–May, with maturation to females by late May. and hatch: late June to early July. First-instar feeding on leaves: July–September. Autumn : second-instar nymphs return to twigs (September–October) to overwinter.

Diet

Phloem sap of Liriodendron tulipifera (tuliptree or -poplar). Feeding involves insertion of into the vascular tissue to withdraw nutrient-rich fluids.

Host Associations

Liriodendron tulipifera - primary Tuliptree or -poplar; exclusive for feeding and . All complete development on this .

Life Cycle

development with three in females. hatch into first-instar that disperse to leaf undersides. After summer feeding, crawlers to second instars and migrate to twigs for . In spring, second-instar resume feeding and molt to females. No male stage has been observed; is presumed to be .

Behavior

Sedentary as and most nymphal stages; only first- are mobile. Seasonal shifting: crawlers move from maternal location on twigs to leaf undersides, then second-instar migrate back to twigs for . Aggregated feeding: multiple individuals often occupy contiguous bark areas, producing localized heavy . is continuous during feeding, with droplets falling to surfaces below. attendance has been observed, with ants honeydew and potentially providing protection from .

Ecological Role

and phloem feeder. Heavy reduce tree vigor through nutrient extraction, causing branch dieback and growth reduction. production supports (Capnodium spp. and others), which blacken bark and leaves and may impair . Honeydew serves as a resource for , , and other . The functions as a model system for studying reproductive biology and evolution.

Human Relevance

Ornamental and forest pest. includes tree decline in landscapes and reduced aesthetic value from blackening. Management options include pruning infested branches, crushing manually, or for severe . Subject of research; include () and such as (Hyperaspis spp.). Recent genomic sequencing (2024) has established T. liriodendri as a reference for understanding evolution and dynamics.

Similar Taxa

Coccus hesperidum (brown soft scale)Both are () with similar hemispherical female and production, but C. hesperidum is on many and lacks the strict to Liriodendron.
Parthenolecanium spp. (oak lecanium scales)Similar and , but oak lecanium occur on Quercus and have different seasonal and .
Ericerus pela (Chinese white wax scale)Both are with recent genomic resources, but E. pela has only 9 versus 17 in T. liriodendri, and is commercially cultivated for production rather than being a pest.