Agrius

Hübner, 1819

sweetpotato hornworms, convolvulus hawkmoths

Agrius is a of hawkmoths () containing approximately 3–5 , most notably Agrius cingulata (sweetpotato ) and Agrius convolvuli (convolvulus hawkmoth). These are large, with distinctive pinkish abdominal . The are economically significant agricultural pests, particularly of sweet potato (Ipomoea batatas) and related Convolvulaceae. are powerful fliers capable of long-distance , with some undertaking transcontinental movements. The genus occurs across tropical and subtropical regions worldwide, with some species extending into temperate zones during summer months.

Agrius cingulata, female, underside. Jamaica by The Trustees of the Natural History Museum, London. Used under a CC BY 3.0 license.

Agrius cingulata by pondhawk. Used under a CC BY-SA 2.0 license.

Agrius cingulata 333113623 by Reinaldo Oliveira Elias. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Agrius: //ˈæɡriəs//

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Identification

Distinguished from the related Manduca by the presence of pink or reddish on the (absent in most Manduca). pattern more uniform and less contrasting than in Manduca. identified by diagonal body stripes and horn coloration; Manduca larvae have oblique stripes and different horn . Agrius convolvuli has more extensive pink coloration on abdomen than A. cingulata. examination may be required for definitive identification in some cases.

Images

Habitat

Tropical and subtropical agricultural lands, gardens, and natural areas where plants (Convolvulaceae) occur. frequent a variety of including coastal areas, woodlands, and urban gardens during . occur on cultivated sweet potato fields and weedy Convolvulaceae in disturbed habitats.

Distribution

Pantropical and subtropical distribution with extensions into temperate regions. Agrius convolvuli: widespread across Africa, southern Europe, Asia, Australia, and Pacific islands; migrates northward into Europe and northern Asia during summer. Agrius cingulata: Americas from Argentina to southern Canada, Caribbean, migratory in North America. Records from northern Europe and North America represent seasonal migrants rather than established .

Seasonality

Year-round breeding in tropical regions; seasonal appearance in temperate zones during summer months (May–September in northern hemisphere). peaks vary by region: late spring to early autumn in Europe and North America. Multiple per year in favorable climates.

Diet

feed on Convolvulaceae, primarily Ipomoea batatas (sweet potato), Ipomoea spp. (morning glories), Convolvulus arvensis (field bindweed), and related . feed on nectar from various flowers with long corolla tubes; recorded visiting Nicotiana, Petunia, and other deep-throated flowers. Some adult exhibit nectar thievery , accessing nectar without .

Host Associations

Ipomoea batatas - primary sweet potato, major agricultural pest
Ipomoea spp. - morning glories and related
Convolvulus arvensis - field bindweed
Arachis hypogaea - occasional groundnut, secondary
Lablab purpureus - Indian bean
Vigna spp. - cowpeas and relatives
Phaseolus spp. - beans

Life Cycle

. laid singly on leaves. through 5–6 , feeding voraciously on leaves; mature larvae may feed on stems and flowers when leaf tissue depleted. Larval duration: 24–42 days depending on and temperature. occurs in soil or leaf litter; pupal duration 14–26 days. emerge and may migrate before breeding. Total time: 55–73 days under laboratory conditions (28°C). Multiple generations annually in tropical climates; single or partial second generation in temperate zones.

Behavior

are powerful, fast fliers capable of sustained hovering . activity pattern with and nocturnal flight; attracted to artificial light sources. Migratory well-documented: A. convolvuli undertakes regular northward into Europe from Mediterranean breeding grounds; A. cingulata migrates northward in North America. Migration appears wind-assisted but directed, not purely . Adults may enter temporary reproductive during migration. are solitary feeders with thrashing defensive behavior when disturbed.

Ecological Role

Significant agricultural pest causing direct damage to sweet potato and related through larval . serve as of some deep-throated flowers, though nectar thievery reduces . contribute to through in natural systems. for various , , and birds. contributes to cross-regional and connectivity.

Human Relevance

Major pest of sweet potato globally; economic impact includes yield reduction and control costs. Subject to programs including using (Cotesia spp.) and . Used as model organism in physiological and neurological research, particularly for studies of muscle metabolism, feeding , and . sometimes encountered by gardeners and naturalists; occasionally mistaken for (Manduca quinquemaculata).

Similar Taxa

ManducaSimilar large gray- sphingid with bodies; distinguished by absence of pink abdominal and different larval stripe pattern
AcherontiaDeath's- hawkmoths share large size and some coloration; distinguished by distinctive thoracic pattern and skull-like marking
HippotionRelated sphingid with similar ; generally smaller with different pattern

More Details

Nectar Thievery

Research in North Dakota documented Agrius cingulata as a 'nectar thief' of the threatened western prairie fringed orchid (Platanthera praeclara), using its long to access nectar without pollinating the flower. This , shared with Manduca quinquemaculata, may impact rare where hawkmoth extends beyond typical breeding ranges.

Feeding Regulation

Studies have identified (HemaP) in A. convolvuli that modulate feeding motivation, demonstrating conserved physiological mechanisms across for regulating foraging .

Migration Ecology

Buglife documentation recognizes A. convolvuli as a notable long-distance migrant among European , with regularly crossing the Mediterranean and moving northward into northern Europe during summer.