This tool is part of the Citrus Resource

Citrus Pests

 

Citrus thrips

 

Scientific name

 

Scirtothrips citri (Thysanoptera, Thripidae)

Other common names

 

bean thrips

Similar species

 

other species in the genus Scirtothrips

Distribution

 

United States: Arizona, California, and Nevada; potentially also occurring in the southeastern United States as well.

Worldwide: Mexico.

Native to the western United States and Mexico.

Diagnostic characteristics

 
Adults
  • Yellow body.
  • Females measure 0.6 to 0.9 mm (0.02 - 0.04 in.) in length.
  • Males are similar in appearance but somewhat smaller.
  • Head is wider than long.
  • Antennae with eight segments, segments 3 - 8 are grey.
  • Both sexes have four wings with numerous fringes surrounding each wing, folded back over the thorax and abdomen when at rest.
Immatures
  • Two larval instars, pre-pupa (3rd instar), and pupa (4th instar).
  • Light orangish-yellow to white body.
  • Larvae resemble adults but wingless.
Eggs
  • 0.2 mm (0.008 in.).
  • Elongate and banana-shaped.

Hosts

 
Citrus hosts

All citrus species and their hybrids.

Non-citrus hosts

Broad host range including:

  • alfalfa, Medicago sativa
  • blueberries, Vaccinium spp.
  • cotton, Gossypium spp.
  • fir, Abies spp.
  • grape, Vitis spp.
  • laurel, Laurus spp.
  • Rhus spp.
  • Rosea spp.

Host damage

 
Fruits
  • Feeding punctures young fruit leaving characteristic ring of grey scarring on the rind.
Leaves
  • Damage young leaves, resulting in leaf distortion.
  • Silvering on leaf surface.
  • Brown frass markings.

Biology

 

Eggs are deposited within young, growing leaves, stems, or fruit. Females are capable of laying up to 250 eggs. Eggs deposited in the fall can overwinter. First and second instars feed on leaves and young fruit. The feeding on young fruit results in cosmetic scarring of the rind. Third and fourth instars are quiescent "pupal" phases that do not feed and may leave the plant to develop in the litter or soil. Citrus thrips have been reported to complete 10 - 12 generations per year.

References

 

Dreistadt, S.H., P.A. Phillips, and C.A. O’Donnell. 2011. Pest notes: Thrips. UC ANR Publication 7429. IPM Education and Publications, University of California Statewide IPM Program.(http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7429.html).

Haviland, D.R., S.M. Rill, J.G. Morse. 2009. Southern highbush blueberries are a new host for Scirtothrips citri (Thysanoptera: Thripidae) in California. Florida Entomologist 92: 147-149. (http://www.fcla.edu/FlaEnt/fe92p147.pdf).

Hoddle, M.S., L.A. Mound, and D. Pena. Thrips of California. CBIT Publishing, Queensland. (http://keys.lucidcentral.org/keys/v3/thrips_of_california/Thrips_of_California.html).

Grafton-Cardwell, E.E., J.G. Morse, N.V. O'Connell, P.A. Phillips, C.E. Kallsen, and D.R. Haviland. 2009. UC IPM pest management guidelines: Citrus. UC ANR Publication 3441. IPM Education and Publications, University of California Statewide IPM Program. (http://www.ipm.ucdavis.edu/PMG/r107304111.html).

Kerns, D., G. Wright, and J. Loghry. 2004. Citrus arthropod pest management in Arizona. University of Arizona, Cooperative Extension Service. (http://ag.arizona.edu/crop/citrus/insects/citrusthrips.pdf).

Authors

 

Weeks, J.A., A.C. Hodges, and N.C. Leppla

 

Citrus Pests
Content last updated June, 2012
idtools.org