Bagrada hilaris

(Burmeister, 1835)

Bagrada bug, Painted bug

Bagrada hilaris is an to Africa and Asia that has become a significant agricultural pest in North America, South America, and Europe. First detected in the Western Hemisphere in Los Angeles in 2008, it has since spread throughout California, Arizona, and other southwestern states, as well as establishing in Chile and Italy. The is a major pest of Brassicaceae including cabbage, kale, broccoli, and cauliflower, causing damage through sap-sucking by both and . Its rapid spread and broad range have made it a priority for research.

Bagrada hilaris by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.

Bagrada hilaris nymph by Raquel Baranow. Used under a CC BY-SA 4.0 license.

Harlequin bug (Bagrada hilaris) (4560488423) by Ton Rulkens from Mozambique. Used under a CC BY-SA 2.0 license.

Pronunciation

How to pronounce Bagrada hilaris: /ˈbæɡrəˌdə hɪˈlærɪs/

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

Identification

Distinguished from the () by its smaller size—approximately half the length at 5–7 mm versus 10–12 mm for M. histrionica. The bright orange-red first- may be mistaken for () but can be distinguished by their shield-shaped body form and association with Brassicaceae plants. are recognized by the combination of small size, black ground color, and and orange markings on the shield-shaped body.

Images

Habitat

Agricultural fields, particularly those cultivating Brassicaceae ; also found in weedy areas with wild and other plants. In invaded regions, it has been observed along river corridors with weedy vegetation. Caper bush (Capparis spinosa) in Mediterranean climates provide suitable . The thrives in warm, arid to semi-arid conditions typical of its range.

Distribution

to southeastern Africa and parts of Asia including India, Pakistan, Afghanistan, Iran, and Iraq. and established in: United States (California, Arizona, Nevada, New Mexico, Texas, Utah, Hawaii), Mexico, Chile, Italy (including Sicily), and Malta. In the United States, first reported in Los Angeles County, California in June 2008; by 2020 had spread as far north as Yolo County, California. In Chile, first detected in 2016 and rapidly established with economic impact.

Seasonality

Activity peaks during summer months when levels are highest. In California's Central Valley and desert agricultural regions, build through the growing season with highest typically observed from late spring through early fall. Specific not documented in available sources.

Diet

feeder on Brassicaceae, with documented including cabbage (Brassica oleracea var. capitata), kale (B. oleracea var. sabellica), cauliflower (B. oleracea var. botrytis), Brussels sprouts (B. oleracea var. gemmifera), broccoli (B. oleracea var. italica), turnips (Brassica rapa), mustard (Sinapis alba, Brassica juncea), rape, arugula (Eruca sativa), and radish. Also recorded on non-brassicaceous : papaya, sorghum, maize, potato, cotton, caper (Capparis spinosa), pearl millet, and various legumes. Both and feed by sucking sap from leaves, causing wilting, yellowing, and stunting.

Host Associations

Brassica oleracea (cabbage, kale, cauliflower, Brussels sprouts, broccoli) - primary major
Brassica rapa (turnip) -
Brassica carinata (Abyssinian cabbage) - less preferred than other brassicas
Sinapis alba (white mustard) -
Brassica juncea (brown mustard) -
Eruca sativa (rocket/arugula) - highly attractive at seedling stage
Capparis spinosa (caper bush) - major pest in Mediterranean
Carica papaya (papaya) -
Sorghum bicolor (sorghum) -
Zea mays (maize) -
Solanum tuberosum (potato) -
Gossypium spp. (cotton) -
Pennisetum glaucum (pearl millet) -
Various legumes -
Lobularia maritima (sweet alyssum) - ornamental
Iberis spp. (candytuft) - ornamental

Life Cycle

(Hemimetabola) with , , and stages. Female lays up to 100 oval to barrel-shaped eggs on leaves or in soil beneath plants. Eggs when freshly deposited, turning orange over time. First- nymph emerges within approximately 8 days. Five nymphal instars occur, with nymphs progressing from bright orange-red to dark coloration, becoming black by the final instar. Developmental rate and number of per year vary with temperature; specific details not documented in available sources.

Behavior

and aggregate in large numbers on plants, causing extensive localized damage. Laboratory studies demonstrate that adults orient toward Brassicaceae seedling volatiles, with stronger attraction to cauliflower and rocket than to Abyssinian cabbage. occurs both on leaves and in soil beneath plants, an unusual among . behavior is influenced by starvation status. Feeding behavior involves sap-sucking from leaf tissue using .

Ecological Role

and agricultural pest; can cause significant damage through direct feeding. Serves as for multiple , providing potential for . In invaded regions, it has become a novel host for parasitoids that have expanded their host range, and for parasitoids under evaluation for .

Human Relevance

Major economic pest of and related vegetables, particularly affecting where chemical control options are limited. Damage includes reduced yield and quality through stunting, wilting, and yellowing of plants. Management challenges arise from its rapid spread, broad host range, and lack of established in invaded regions. Research programs on including , trap cropping with Brassicaceae seedlings, and management. Potential biological control agents under investigation include the Trissolcus basalis, Gryon spp., Ooencyrtus mirus, Ooencyrtus lucidus, and Idris elba.

Similar Taxa

Murgantia histrionica (Harlequin bug)Similar and appearance; distinguished by larger size (approximately 10–12 mm versus 5–7 mm for B. hilaris) and status in North America
Murgantia histrionica nymphsBoth have bright coloration; distinguished by size, body shape, and associations

More Details

Biological Control Research

Multiple have been identified as potential control agents. In Mexico, Idris elba () was discovered parasitizing B. hilaris eggs in 2019. In California, Ooencyrtus mirus (Pakistani origin) and O. lucidus (apparently to California) are under evaluation. In Kenya, Trissolcus basalis and Gryon sp. have been identified as native parasitoids. In Mexico, Gryon myrmecophilum, Telenomus podisi, and Trissolcus basalis have been recorded.

Trap Crop Potential

Seedlings of Brassica oleracea and Eruca sativa have demonstrated effectiveness as trap plants in caper bush , diverting hundreds of individuals from main .

Invasion History

The 2008 Los Angeles represents the first Western Hemisphere record. The ' rapid northward expansion in California (reaching Yolo County by 2020) and establishment in Chile (2016) demonstrate significant potential in Mediterranean and semi-arid climates worldwide.