Datana major

Grote & Robinson, 1866

azalea caterpillar, major datana

Datana major is a in the , commonly known as the azalea or major datana. The ranges across the eastern and central United States, from Maryland south to Florida and west to Kansas and Arkansas. are active from June to August, with one per year in most of the range and a partial second generation in southern areas. The are notable pests of azaleas and related ornamental plants.

Datana major SERC 06-30-17 0149 (35417516430) by Smithsonian Environmental Research Center. Used under a CC BY 2.0 license.

Datana major01 by James Sullivan, Research Collection of J. B. Sullivan. Used under a Copyrighted free use license.

Datana major larva2 by John A. Weidhass. Used under a CC BY 3.0 license.

Pronunciation

How to pronounce Datana major: /dəˈteɪnə ˈmeɪdʒər/

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Identification

can be distinguished from other Datana by pattern and . The combination of geographic range and period helps separate D. major from similar species. are recognized by their distinctive black, , and red striped pattern and association with Rhododendron and Andromeda. They can be distinguished from the walnut (Datana integerrima) by and larval coloration pattern.

Images

Habitat

Found in deciduous and mixed forests, suburban landscapes, and commercial nurseries. Associated with containing plants in the Ericaceae, particularly cultivated azaleas and rhododendrons.

Distribution

Eastern and central United States: Maryland to Florida, west to Kansas and Arkansas. The is most common in the southeastern United States.

Seasonality

are on from June to August. Normally one per year; a partial second generation may occur in the southern part of the range.

Diet

feed primarily on Rhododendron and Andromeda polifolia (bog rosemary). They are feeders on Ericaceae. do not feed.

Host Associations

Rhododendron - larval primary , including cultivated azaleas
Andromeda polifolia - larval bog rosemary,

Life Cycle

are laid in masses on the undersides of leaves. feed gregariously when young, dispersing as they mature. They undergo five before dropping to the ground to pupate in a in soil or leaf litter. emerge the following summer. In the southern range, some individuals may complete a partial second .

Behavior

exhibit gregarious feeding when young, with groups of larvae consuming leaves from the edges inward. When disturbed, larvae raise their and tail in a characteristic U-shaped defensive posture. This behavior, combined with bright warning coloration, advertises their unpalatability to .

Ecological Role

As a on Ericaceae, D. major contributes to in forest . The serves as for various and . Larval is typically localized and does not cause significant tree mortality in natural settings.

Human Relevance

Considered a significant pest of ornamental azaleas and rhododendrons in nurseries and landscapes. can cause substantial aesthetic damage to valued plantings. are often noticed by homeowners due to their conspicuous coloration and gregarious feeding. Control is rarely necessary in natural forests but may be warranted in commercial and ornamental settings.

Similar Taxa

Datana integerrimawalnut ; similar larval appearance but feeds on Juglandaceae (walnut, hickory) rather than Ericaceae
Datana ministra-necked ; similar striped larval pattern but has yellow behind and feeds on diverse hardwoods
Datana perspicuaspotted datana; similar appearance but differs in pattern and larval plants

More Details

Taxonomic history

First described by Grote & Robinson in 1866. The has been variously treated in literature, with some sources referring to it as Drexel's datana.

Pest management

In ornamental settings, can be removed by hand or with targeted . is effective against young larvae. including and birds often provide adequate .