Figures
Fig. 1: Antenna (inset: V. and VI. antennal segment)
Fig. 2: Head dorsal with ocellar triangle
Fig. 3: Pronotum
Fig. 4: Meso- and metanotum
Fig. 5: Forewing
Fig. 6: Tergites VI and VII
Fig. 7: Sternites VII and VIII
Fig. 8: Tergite VIII
ITS-RFLP gel patterns (1&8 ladder, 2 PCR-product, 3 RSAI, 4 HaeIII, 5 MspI, 6 HinfI, 7 AluI)
Fig. 9: Primer pair CS249/CS250
Fig. 10: Primer pair P1/28Z
Fig. 11: Primer pair 18SMP/28SMP
Taxonomic Information
Species:
Pezothrips kellyanus (Bagnall, 1916)
Synonyms:
Physothrips livii Girault, 1930
Common name:
Kelly's citrus thrips
Present taxonomic position:
Family: Thripidae Stephens, 1829
Subfamily: Thripinae (Stephens) Karny, 1921
Genus: Pezothrips Karny, 1907
Species Recognition
General information about the genus Pezothrips:Only nine species are currently known in the genus Pezothrips and are recognized by having eight antennal segments with forked sense cones on segments III and IV, three pair of ocellar setae present, four long setae on the pronotum, the metanotum has two campaniform sensilla present, and the forewing has two setae distally and a complete row of setae on the second vein.
Typical character states of Pezothrips kellyanus:
Body color
Mainly brown
Antennae
Number of antennal segments: 8
Segment IV - forked sensorium: scarcely extending beyond base of segment V
Segments II and III shape: more or less symmetric
Segments III & IV sensoria: emergent and forked
Base of sensorium on antennal segment VI: no more than 2 times as wide as base of nearest seta
Terminal antennal segments: rarely elongate
Head:
Distance between bases of ocellar setae III: less than width of first ocellus
Head shape between compound eyes: not prolonged
Major postocular setae: less than half as long as ocellar setae III
Postocular setae I: present
Surface of head, pronotum and fore legs: without strong reticulate sculpture
Ocellar setae I in front of anterior ocellus: present
Prothorax
Number of pairs of elongate pronotal setae: 0-3
Number of pairs of elongate posteroangular pronotal setae: 2
Pronotum shape: rectangular
Number of pairs of pronotum posteromarginal minor setae: 3-5
Number of pairs of pronotum anteromarginal minor setae: 1-2
Mesothorax
Mesothoracic endofurca: with median spinula
Metathorax
Metanotal median area sculptured lines: transverse at anterior, but with irregular equiangular reticulation near posterior
Metanotal median setae length: longer than lateral metanotal setae
Metanotal median setae position: arising at anterior margin
Metanotum: without campaniform sensilla
Metanotum major sclerite: with two major sclerites, metascutum and metascutellum
Metanotum median area: with at least some equiangular reticulation or with no equiangular reticulation
Metanotum sculpture: without dominant sculptured triangle medially
Metathoracic endofurca: transverse, sometimes with simple median spinula
Wings
Wings: present and more than half as long as abdomen
First vein of forewing: distinct from costal vein
Forewing anterior margin: with setae and cilia but cilia longer than setae
Forewing color: uniformly dark or shaded, but with base (or sub-base) pale
Forewing costal fringe of cilia: arising at anterior margin of wing
Forewing costal setae at middle of wing: shorter than median width of wing
Forewing first vein setal row: incomplete, with setae not closely and uniformly spaced
Forewing posterior margin cilia: undulated near apex
Forewing second vein setal row: complete, with setae closely and uniformly spaced
Forewing surface: not reticulate
Forewings: with veins, setae and microtrichia
Legs
Fore tibial apex: not extending around fore tarsus
Mid and hind tarsi: with two segments
Abdomen:
Abdominal pleurotergites: not covered in microtrichia
Abdominal segment X: never tubular, longitudinally incomplete ventrally in both sexes
Abdominal sternite II: with marginal setae but no discal setae
Abdominal sternite III of female: without glandular areas
Abdominal sternite VII: with marginal setae but no discal setae
Abdominal sternite VII median marginal setae: arising in front of margin
Abdominal sternites IV , V and VI: with marginal setae but no discal setae
Number of lateral marginal setae on abdominal tergite II: 4
Abdominal tergites: without curved wing-retaining setae
Abdominal tergites IV & V median setal pair: much shorter than distance between their bases
Abdominal tergites V-VII: without paired ctenidia, sometimes with irregular microtrichia
Setae on abdominal tergite X: slender
Surface of lateral thirds of abdominal tergites: without regular rows of fine microtrichia
Ctenidia on tergite VIII: not present, but groups of microtrichia
Tergite VIII posteromarginal comb of microtrichia: present laterally, incomplete medially
Tergite VIII posteromarginal microtrichia: short and irregular in length
Biology
Life history:
As with other thrips species the life cycle from egg to adult is dependent on temperature. The full cycle can take about 15 days to over a month and adults may live for more than one month producing several generations in one year depending on seasonal weather (Lewis, 1973). With greenhouse temperatures the developmental time from egg to adult can decrease to about one week.
Host plants:
Citrus, Jasmin and Pittosporum flowers, polyphagous
Vector capacity:
None identified
Current known distribution:
Asia, Australia, New Zealand, Europe
Additional notes:
This species has been found breeding in highly fragrant flowers of Citrus, Jasmin, and Pittosporum.
Bibliography
Lewis, T (1973): Thrips their biology,
ecology and economic importance. Academic Press Inc., London Ltd. 349
pp.
Moritz G, Morris DC, Mound LA (2001): ThripsID -
Pest thrips of the world. ACIAR
and CSIRO Publishing Collingwood, Victoria, Australia, CDROM ISBN
1 86320 296 X.
Moritz G, Mound LA, Morris DC, Goldarazena A (2004): Pest
thrips of the world - an identification and information system using molecular
and microscopial methods. CBIT, University of Queensland,CDROM ISBN 1-86499-781-8.
Vassiliou, VA (2007): Chemical control of Pezothrips kellyanus (Thysanoptera
: Thripidae) in citrus plantations in Cyprus. - Crop Protection 26 (10): 1579-1584.
Webster, KW, Cooper, P & Mound, LA (2006): Studies on Kelly's
citrus thrips, Pezothrips kellyanus (Bagnall) (Thysanoptera : Thripidae):
sex attractants, host associations and country of origin. - Australian Journal
of Entomology 45: 67-74.
Links:
Mound, LA (2005): Thysanoptera (Thrips) of the World
- A Checklist. http://www.ento.csiro.au/thysanoptera/worldthrips.html