Tetraneura nigriabdominalis

(Sasaki, 1899)

Tetraneura nigriabdominalis is a holocyclic, heteroecious gall-forming native to East Asia that has expanded its range globally and is now established in Europe and North America. The alternates between primary (elm trees, Ulmus) and secondary hosts (roots of grasses in the Poaceae, including maize). On elms, fundatrices induce characteristic galls on leaves, with development rates and strongly influenced by spring temperatures. The species has been documented as a potential agricultural pest due to its association with cultivated maize.

Tetraneura nigriabdominalis 141839809 by megachile. Used under a CC0 license.

Tetraneura nigriabdominalis-galls by peterwchen. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Tetraneura nigriabdominalis: //ˌtɛtrəˈnʊərə ˌnɪɡriæbdɒmɪˈneɪlɪs//

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

Identification

Winged morphs developing in galls on Ulmus can be distinguished from the similar Tetraneura ulmi by specific morphological characteristics of the winged forms; detailed morphological comparison reveals diagnostic features separating these two that both occur on elm .

Images

Habitat

Primary are elm trees (Ulmus spp.), including Ulmus minor, Ulmus glabra, and Ulmus davidiana var. japonica, where galls form on leaves. Secondary hosts are roots of grasses (Poaceae), including Zea mays (maize) and other grass . Gall formation occurs predominantly on medial and basal parts of leaf blades.

Distribution

Native to East Asia (Japan, described from specimens collected by Sasaki in 1899); established in Europe with records from Poland, Belgium, and other locations showing northward range expansion; present in North America (Vermont, USA). The northward expansion in Europe is presumably connected with climate warming.

Seasonality

Fundatrices hatch between late April and mid-May (27 April to 12 May in studied ). First galls appear 6–8 days after fundatrix hatching. Fundatrices mature within 12–21 days and produce nymphs within 2–3 weeks. Winged migrants of the second appear between late May and late June. Complete development of two generations on the primary lasts four to six weeks, depending on temperature.

Diet

Phloem sap from primary elm trees (Ulmus spp.) during gall-forming ; phloem sap from secondary host grass roots (Poaceae) during parthenogenetic generations on secondary hosts.

Host Associations

Ulmus minor - primary suitable for fundatrices and gall development; females less fecund than on U. glabra (1–29 nymphs)
Ulmus glabra - primary suitable for fundatrices and gall development; females more fecund than on U. minor (2–58 nymphs)
Ulmus davidiana var. japonica - primary native ; site of male production in second
Poaceae - secondary grass roots, including cultivated
Zea mays - secondary maize; potential agricultural threat given expanding in Europe

Life Cycle

Holocyclic and heteroecious with alternation. Fundatrices hatch on primary host (Ulmus) in spring and induce galls. Second includes males produced on primary host; these migrate to secondary host (Poaceae roots) where mating occurs with females. Parthenogenetic generations continue on secondary host roots. involves males locating females using visual cues from female body shape; males exhibit mate guarding and attempt multiple matings.

Behavior

Gall-forming: fundatrices induce abnormal plant tissue growth on elm leaves for and feeding. Males use visual cues, specifically female body shape, to locate potential mates; female wing posture influences male approach . Males exhibit mate guarding behavior and attempt multiple matings with different females. Development and activity are strongly temperature-dependent, with April temperatures significantly influencing developmental duration and fundatrix .

Ecological Role

Induces galls on elm leaves, creating specialized microhabitats that may affect leaf physiology and plant defense responses. Gall tissues show reduced responsiveness to jasmonic acid signaling compared to normal leaf tissue, indicating manipulation of plant defense . Potential pest of cultivated cereals, particularly maize, through root feeding on secondary hosts.

Human Relevance

Potential agricultural pest: association with maize (Zea mays) and expanding range in Europe raises concern given increasing maize area. Subject of research on gall induction mechanisms, plant-insect interactions, and climate change effects on insect range expansion.

Similar Taxa

Tetraneura ulmiBoth form galls on elm trees (Ulmus) and occur in northwestern Europe; T. nigriabdominalis is expanding its range while T. ulmi dominates in northwestern Europe; morphological characteristics of winged morphs allow distinction