Acrobasis angusella

Grote, 1880

Hickory Leafstem Borer, Leafstem Borer, Hickory Leafstem Borer Moth

Acrobasis angusella, described by Grote in 1880, is a snout moth in the Pyralidae. The is known from Quebec, Canada, and the northeastern United States. have a wingspan of approximately 18 mm and are active from May through September. The larvae are specialized feeders on hickory species (Carya), boring into leaf stems and causing premature leaf drop.

Acrobasis angusella 56079572 by christine123. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Acrobasis angusella: /ˌækrəˈbeɪsɪs ˌæŋɡjuːˈsɛlə/

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Identification

Distinguished from other Acrobasis by association with hickory (Carya) and the specific habit of boring in leaf stems rather than nuts or shoots. Acrobasis nuxvorella (pecan nut casebearer) attacks pecan nuts and has a distinctive ridge of dark across the forewings. Acrobasis juglandis and A. betulella are associated with walnut and birch respectively. Definitive identification may require examination of genitalia or molecular analysis.

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Habitat

Deciduous forests and woodlands where hickory (Carya) occur. Also found in suburban and rural areas with hickory trees. The species is closely tied to the presence of its plants.

Distribution

Known from Quebec, Canada, and the northeastern United States. Distribution records include Vermont. The range corresponds to that of its primary hickory .

Seasonality

are on wing from May to September. The extended period suggests multiple or a prolonged pattern, though specific voltinism is not documented.

Diet

Larvae feed exclusively on Carya , including Carya glabra (pignut hickory), Carya ovalis (red hickory), and Carya tomentosa (mockernut hickory). Larvae bore into the leaf stems (petioles) of plants. feeding habits are not documented.

Host Associations

Carya glabra - larval pignut hickory
Carya ovalis - larval red hickory
Carya tomentosa - larval mockernut hickory

Life Cycle

Complete with , larva, pupa, and stages. Larvae bore into leaf stems of hickory, causing leaves to fall prematurely. likely occurs in soil or leaf litter, though this is not explicitly documented. Specific details on egg placement, number of , and stage are not available.

Behavior

Larvae are stem borers, tunneling within hickory leaf petioles. This feeding results in leaf abscission. The mechanism by which larvae induce leaf drop is not described in detail.

Ecological Role

As a herbivore on hickory, the contributes to leaf turnover in forest . The premature leaf drop caused by larval feeding may affect photosynthetic capacity of trees, though the ecological impact is likely minor on healthy trees. The species serves as host for , including potential association with Mesostenus species (Ichneumonidae).

Human Relevance

Considered a minor pest of hickory. The leaf drop caused by larval feeding can be conspicuous but is generally not economically significant. No specific management recommendations are documented. The is not known to be a target of programs.

Similar Taxa

Acrobasis nuxvorellaAlso in Acrobasis, but attacks pecan nuts rather than leaf stems; has distinctive ridge of dark on forewings; economically significant pecan pest
Acrobasis juglandisAssociated with walnut (Juglans) rather than hickory; different specificity
Acrobasis betulellaAssociated with birch (Betula); different plant

More Details

Parasitoid associations

The Acrobasis, including A. angusella, is known to be parasitized by ichneumonid wasps in the genus Mesostenus, which use their long ovipositors to attack stem-boring caterpillars. Specific records for A. angusella are not documented but are plausible given the of related .

Taxonomic history

Described by Augustus Radcliffe Grote in 1880, a prominent 19th-century American entomologist who described numerous Lepidoptera .