Status
Conservation status
Not Assessed
First reported in the wild
1987
Invasiveness
Invasive species - risk of High Impact
Irish status
Present in the Wild
Introduction pathways - 1
Transport Contaminant
Introduction pathways subclass - 1
Parasites on plants
Invasive score
18
NAPRA Ireland risk assessed
No
Species Biology
Identification
Tiny, slender, phytophagous (eat plants) insect with narrow fringed wings, with a highly variable morphology, adult females colours range from white to yellowish orange to nearly black size 1.6-1.7 mm long, with pale adult males 1.2–1.3 mm long, nymphs (larvae) are yellowish-white (Kirk & Terry, 2003; Roques, 2006).
Ecology
Major pest of a wide range of agricultural crops including pepper, cucumber, apricot, chrysanthemum, plum, roses and strawberries (EPPO, 2015), as well as responsible for transferring a number of plant disease (Kirk & Terry, 2003).
Habitat
Constructed, industrial or other artificial habitats
Reproduction
Parthenogenic (can reproduce from unfertilised eggs), with males emerging from unfertilised eggs, 12-15 generations per year, with the life cycle duration being temperature dependent lasting from 15-41 days (Roques, 2006).
Pathway and vector description
Originally native to the western North America, from Mexico to Alaska, it spread to Holland in 1983 and from there spread across Europe and Asia at a rate of ~229km/year, suggesting human mediated dispersal rather than natural spread (Kirk & Terry, 2003). Distribution appears to have been largely unchanged until the 1960s and the rapid and wide spread is thought to have been as the result of a insecticide resistant strain developing (Kirk & Terry, 2003).
Mechanism of impact
Grazing/Herbivory/Browsing, Disease transmission
Broad environment
Terrestrial
Habitat description
Feeds on a wide range of species, unlikely to be able to survive out of doors overwinter in Ireland, it is largely found in greenhouses, though Irish records are based on the 1980s (Dunne & O'Connor, 1989).
Species group
Invertebrate
Native region
North America
Distribution
World distribution(GBIF)
Irish distribution
Established - Widespread. The European and Mediterranean Plant Protection Organisation classify this species as "Present and Widespread" in Ireland but this assessment is based on information form 1993 (EPPO, 2015). Found in greenhouses, as they require high humidity and temperature (Fatnassi eet al., 2015) the current status of this species in Ireland is unknown, though it is certainly present.
Native distribution
Originally native to the west of North America from Mexico to Alaska (Kirk & Terry, 2003).
Temporal change
Date of first record category
1981-1990
Fifty year date category
1951-2000
Records submitted to Data Centre in 2024
The following map is interactive. If you would prefer to view it full screen then click here.
How can you help
Report any sightings to the National Biodiversity Data Centre.
Further information
Delivering Alien Invasive Species In Europe (DAISIE) project the western flower thrip as one of the 100 Worst Invaders in Europe.
References
Publications
EPPO (2015) PQR EPPO Database on quarantine plants. European and Mediterranean Plant Protection Organisation[Online]. Dunne, R., & O'Connor, J. P. (1989). Some insects (Thysanoptera: Diptera) of economic importance, new to Ireland. The Irish Naturalists' Journal, 63-65. Fatnassi, H., Pizzol, J., Senoussi, R., Biondi, A., Desneux, N., Poncet, C., & Boulard, T. (2015). Within-Crop Air Temperature and Humidity Outcomes on Spatio-Temporal Distribution of the Key Rose Pest Frankliniella occidentalis. PloS one, 10(5), e0126655. Kirk, W. D., & Terry, L. I. (2003). The spread of the western flower thrips Frankliniella occidentalis (Pergande). Agricultural and Forest Entomology, 5(4), 301-310.
Relevant links
http://www.eppo.int/ http://www.europe-aliens.org/speciesFactsheet.do?speciesId=51119 http://www.cabi.org/isc/datasheet/24426