Liriomyza trifolii

(Burgess, 1880)

American serpentine leafminer, celery leafminer

is a small leaf-mining in the , to the Caribbean and southeastern United States. It has become a globally distributed pest of greenhouse and vegetable , recognized as one of the three most damaging worldwide. The species is highly , feeding on numerous ornamental and vegetable plants including chrysanthemums, celery, and tomatoes. Its spread has been facilitated by and international trade in material.

Rainforest at cedar creek (14383699073) by Daniela. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Liriomyza trifolii: /ˌlɪri.əˈmaɪzə trɪˈfoʊli.aɪ/

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

Identification

distinguished from the very similar Liriomyza sativae by the dark, matte (L. sativae has a shiny black mesonotum). Small size (<2 mm), coloration with dark thoracic markings, and transparent with characteristic aid field identification. Larval identification requires examination of body shape (non-tapering end) and mouthpart measurements for determination.

Images

Habitat

Naturally occurs in tropical and subtropical regions. Frequently infests greenhouses, enabling establishment in temperate climates beyond its natural range. Development and survival are temperature-dependent, with optimal conditions around 30°C for pupal survival and . Less successful in cooler climates though can persist in protected environments.

Distribution

to the Caribbean and southeastern United States (concentrated in southern Florida). and established across multiple continents including: North America (California, Canada), Central America and Caribbean, South America (Brazil, Colombia, Venezuela, Peru), Europe (widespread including Mediterranean region), Asia (China, Japan, Korea, Taiwan, India, Israel, Philippines, Turkey), Africa (Kenya, Nigeria, South Africa, Egypt, Tanzania, Réunion), and Oceania (Australia, Hawaii, Guam, Samoa). primarily via international trade in material.

Seasonality

of 21–28 days in , allowing multiple per year in warm climates. Continuous breeding possible in greenhouses. Activity and development rates strongly temperature-dependent; peak reproductive output at 30°C.

Diet

Both larval and female stages feed on leaves. feed primarily on the mesophyll layer just below the leaf , creating serpentine mines. Adult females puncture leaves to feed on exuding sap; these punctures may also serve as sites. Highly with documented hosts including chrysanthemums, Gerbera daisies, celery, tomatoes, beans, potatoes, onions, and numerous other vegetable and ornamental . Oviposition rate and significantly higher on preferred hosts (celery, chrysanthemums) compared to less suitable hosts (tomatoes).

Host Associations

Chrysanthemum - highly preferred
Gerbera - highly preferred
Apium graveolens (celery) - preferred ; refers to this association
Solanum lycopersicum (tomato) - less preferred , reduced rates
Phaseolus (beans) -
Solanum tuberosum (potato) -
Allium cepa (onion) -
Arachis (peanut) -
Hibiscus -
Diglyphus isaea - eulophid
Phaedrotoma sp.2 -
Braconidae (various) - significant
Eulophidae (various) - significant
Pteromalidae (various) - significant

Life Cycle

with four stages: , , , . Eggs laid within 24 hours of mating, typically during daylight, at rate of 35–39 eggs per day on optimal . Total lifetime 200–400 eggs on preferred hosts. Eggs inserted into tubular punctures on leaf undersides, just below . Larvae hatch and mine through leaf tissue, passing through four (three feeding instars, fourth non-feeding). Mature larvae exit mines and drop to soil to pupate. Adult females live 13–18 days; males 2–3 days (males cannot puncture plants and have difficulty feeding). Multiple per year possible in favorable conditions.

Behavior

females exhibit selection , making multiple punctures before selecting sites. Oviposition punctures are tubular or fan-shaped; feeding occurs on sap from these punctures. Males perform rapid vertical 'bobbing' movements near females as apparent , possibly accompanied by short-distance vocalizations. Males display -flexing behavior during copulation when rival males approach, likely as display. Aggression between males observed only under severely overcrowded laboratory conditions. avoidance behavior not documented.

Ecological Role

and agricultural pest. Larval leaf mining damages photosynthetic tissue; feeding punctures create additional stress. in natural range primarily by (, , ). In invaded regions, potential exists through these parasitoids though use often disrupts this control. serve as but have limited impact compared to parasitoids.

Human Relevance

Major economic pest of greenhouse and field , particularly floriculture and vegetable production. Designated in multiple countries. Responsible for significant : California chrysanthemum industry lost approximately $93 million in the 1980s. Damage mechanisms include direct leaf destruction, seedling mortality, transmission, and reduced fruit quality. Management relies on integrated approaches including ( /release), (though is widespread), cultural practices, and quarantine protocols. has been a major factor in global spread, as treated export material failed to eliminate .

Similar Taxa

Liriomyza sativaeExtremely similar ; distinguished by shiny black versus the dark matte mesonotum of L. trifolii. Both are and can co-occur, though L. trifolii is generally more associated with greenhouse environments and has broader global distribution.
Liriomyza huidobrensisAnother major pest; primarily limited by high temperatures (upper threshold ~28–29°C) and more associated with highland/montane in range. Has narrower thermal than L. trifolii and is not established in the United States.

More Details

Insecticide Resistance

Development of to multiple has been critical to the global success of L. trifolii. Resistance allowed survival on treated export , facilitating intercontinental . remains a central challenge in control programs.

Biological Control Potential

provide significant when pressure is low. through selective insecticide use and management can enhance parasitoid efficacy. Augmentative releases of commercially available parasitoids (e.g., Diglyphus isaea) are used in greenhouse systems.