Datana major

Grote & Robinson, 1866

azalea caterpillar, major datana

Datana major is a in the Notodontidae, commonly known as the azalea caterpillar 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 larvae 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 wing pattern and genitalia. The combination of geographic range and period helps separate D. major from similar species. Larvae are recognized by their distinctive black, yellow, and red striped pattern and association with Rhododendron and Andromeda. They can be distinguished from the walnut caterpillar (Datana integerrima) by plant 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 wing from June to August. Normally one per year; a partial second generation may occur in the southern part of the range.

Diet

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

Host Associations

Rhododendron - larval food plantprimary , including cultivated azaleas
Andromeda polifolia - larval food plantbog rosemary, native

Life Cycle

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

Behavior

Larvae 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 herbivore on Ericaceae, D. major contributes to nutrient cycling in forest . The serves as prey for various and . Larval defoliation 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. Larvae 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 caterpillar; similar larval appearance but feeds on Juglandaceae (walnut, hickory) rather than Ericaceae
Datana ministrayellow-necked caterpillar; similar striped larval pattern but has yellow band behind and feeds on diverse hardwoods
Datana perspicuaspotted datana; similar appearance but differs in wing 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, larvae can be removed by hand or with targeted applications. Bacillus thuringiensis is effective against young larvae. Natural enemies including and birds often provide adequate .