Plutella xylostella

(Linnaeus, 1758)

diamondback moth, cabbage moth

is a globally distributed and one of the most economically significant agricultural pests worldwide. The small grayish-brown moth derives its from the cream-colored band that forms a diamond pattern along its back. Its larvae feed exclusively on cruciferous plants, causing extensive damage to cabbage, broccoli, cauliflower, canola, and other Brassica crops. The species has evolved resistance to nearly every class of , including Bacillus thuringiensis toxins, making it exceptionally difficult to control. global management costs are estimated at $4–5 billion.

Plutella xylostella 86292975 by Niklas Wahlberg. Used under a CC0 license.

Plutella xylostella 103306336 by Kaden Stebbins. Used under a CC0 license.

Plutella xylostella 97330768 by Jonathan Whitaker. Used under a CC0 license.

Pronunciation

How to pronounce Plutella xylostella: /pluːˈtɛlə zaɪloʊˈstɛlə/

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

Identification

are small with a wingspan of approximately 12–15 mm. The forewings are narrow and grayish-brown with a distinct cream or pale yellow band that forms a diamond-shaped pattern along the margin when the wings are folded at rest. This diamond pattern is the key visual diagnostic feature. The hindwings are narrow and fringed. Larvae are small, greenish, and tapered at both ends, reaching about 10 mm at maturity.

Images

Habitat

Agricultural and natural environments wherever cruciferous plants occur. Found in cultivated fields, gardens, and weedy areas containing wild Brassicaceae. are highly mobile and wind-borne, enabling of temporary .

Distribution

distribution spanning all continents except Antarctica. Present throughout Europe, Asia, Africa, North and South America, Australia, and Pacific islands. Native origin uncertain; possibly Europe, South Africa, or the Mediterranean region. Now established wherever cruciferous grow, from tropical to temperate zones.

Seasonality

Multivoltine with continuous breeding in warm climates; peaks vary regionally. In temperate regions, activity resumes in spring with from sites or recolonization by wind-dispersed .

Diet

Larvae feed exclusively on plants in the Brassicaceae (Cruciferae). Documented include cabbage (Brassica oleracea var. capitata), broccoli, cauliflower, kale, canola, and various wild crucifers.

Host Associations

Brassica oleracea - primary cabbage, broccoli, cauliflower
Brassica napus - primary canola, rapeseed
Brassica rapa - primary turnip, field mustard
Sinapis arvensis - wild
Capsella bursa-pastoris - wild shepherd's purse

Life Cycle

Complete with four developmental stages: , larva, pupa, and . Eggs are laid singly or in small groups on leaves. Larvae pass through four instars. Development time from egg to adult ranges from 23–30 days depending on host plant and temperature; development is fastest on white cabbage (23.4 days at 20°C) and slowest on broccoli (26.1 days). Multiple overlapping occur annually in favorable climates.

Behavior

are and strongly phototactic. Highly migratory; wind-borne adults can travel long distances, enabling rapid invasion of new regions and seasonal recolonization of temperate areas. stages can be transported on plant material, facilitating human-mediated .

Ecological Role

Herbivore and agricultural pest. Serves as for including Cotesia plutellae and Diadegma semiclausum. can significantly alter plant composition in agricultural settings.

Human Relevance

Major economic pest of cruciferous vegetable and oilseed crops worldwide. Management costs exceed $4 billion annually. Subject of extensive research on resistance evolution. Target of programs and novel genetic control methods including self-limiting gene technologies.

Similar Taxa

Plutella australianaCryptic sister found only in Australia; distinguished by barcodes and internal reproductive anatomy, not external . Previously confused with P. xylostella.