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Species Account


USNM; Female; Det. Nielson; 'Kaslo B. C.'; Coll.: H G Dyar
i14114

USNM; Female; Det. Nielson; 'Kaslo B. C.'; Coll.: H G Dyar
i14115

USNM; Female; Det. Nielson; 'San franc. Mt'; Coll.: E D Ball; Date: 8-12-29
i14116

USNM; Female; Det. Nielson; 'Kaslo B. C.'; Coll.: H G Dyar
NMW Image No. i14114

Colladonus flavocapitatus (Van Duzee 1890f: 80 )

Membracoidea : Cicadellidae
Diseases Transmitted
Western X-disease phytoplasma 16SrIII-A Phytoplasma

Distribution Map
(simplified continental distribution)
Geographical Distribution:

Recorded Distribution(s):
It occurs in western. Nearctic America. In 1948 DeLong and Severin (196) reported this species under the name “Colla¬donus commissus (Van Duzee)” from Montara, San Mateo County, Calif. Specimens were examined from California, Colora¬do, Oregon, Utah, Washington, Alberta, British Columbia, and Alaska by Nielson in 1957 (561). (Nielson, 1968)

Colladonus flavocapitatus (Van Duzee 1890f: 80 )
Diseases Transmitted Pathogen Type
Western X-disease phytoplasma 16SrIII-A Phytoplasma
Crops Affected by Colladonus flavocapitatus (Van Duzee 1890f: 80 )
Rice Citrus Carrot
Barley Apple Tomato
Maize (Corn) Pear Potato
Sugarcane Elm Strawberry
Wheat Palms Rubus
Sorghum Grapevine Papaya
Other (grasses/cereals) Ornamentals Peach

This species is a vector of the western strain of North American aster yellosvs virus. Between 1947 and 1948, it was first reported as a vector by Severin (701, 703, 704) under the name of “Colladonus commissus.” Transmission of the virus was effected from diseased celery and aster to healthy celery and aster plants. Percent infection from celery to celery ranged from 22 to 69 and from aster to aster, 0 to 20. One female retained the virus for 27 days after producing the first infection. Transmission of the curly top virus of sugarbeets and Pierce’s disease virus of grapes could not be demonstrated.
(Nielson 1968)

This species for the present is not considered an important vector of this virus in California. Further studies are necessary to establish the correct identity of species involved in transmission of the virus. It is not certain whether commissus is a vector of this virus.


(Nielson 1968)

Identification Plates
Colladonus flavocapitatus


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Plate 1
Species Description

Length:
Medium size, linear species. Length of male 4.30—4.60 mm., female 4.80—5.00 mm.

Colour:
General color yellowish brown. Crown and pronotum yellowish brown to ivory, immaculate; elytra light brown, veins ivory or yellow.
.

Genitalia:
Pygofer in lateral aspect slightly longer than wide, ventral margin concave at middle, caudal margin truncate, dorsal margin with distal part convex; pygofer spine well developed, long, straight, lanceolate, arising caudoventrally, projecting posterodorsally; caudoventral margin area with many minute setae; caudodorsal and dorsal submarginal areas with many long setae; aedeagus with bifurcate processes about one-half as long as aedeagal shaft, tubular, narrowed apically, crossing in dorsal aspect; gonopore of aedeagus at midlength of shaft; style in dorsal aspect about 1% times as long as connective; stylar shaft short, narrow, about twice as long as basal width, curved slightly posterolaterally, sides parallel; stylar spine apical, long, pointed apically, projecting posterolaterally; female seventh sternum in ventral aspect about twice as wide as long, anterolateral margins parallel, posterolateral part curved mesally, posterior margin nearly truncate on each side of median spatulate process; median emargination V-shaped, shallow, less than one-half length of segment; spatulate process short, subequal, produced to posterior margin, with sides parallel, apex bifid.

Species Diagnosis

This species is similar to holmesi in general habitus and can be separated by the male pygofer with the caudal margin truncate and the style with a long apical projection. Some confusion exists in the literature regarding the identity of this species. The illustrations of the genitalia labeled as “commissus” by DeLong and Severin from 1948 (196, fig. 5, p. 193) and colored drawings by Severin in 1948 (704, p1. 1, C) are of fiavocapitatus. The female specimen (p1. 1, D) resembles more closely commissus than flavocapitatus. Moreover, these authors’ illustrations of general habitus, male genitalia (fig. 6, A, C, D; p. 194), and colored plate of adults (p1. 1, E, F) labeled as “flavocapitatus” -are identical with holmesi Bliven. The female seventh sternum (fig. 6, B, p. 194) is identical with that of commissus.

(Nielson 1968)

Ecology

Host Plant Activity Period (Months) Dormancy Generations
- -
Eggs -
Nymphs -
Adult -
One per year -
Continuous -
Variable -
Colladonus flavocapitatus (Van Duzee 1890f: 80 )

Higher taxonomy

Kingdom Phylum Class Order Superfamily Family
Animalia Arthropoda Insecta Hemiptera
Suborder: Auchenorrhyncha
Infraorder: Cicadamorpha
Membracoidea Cicadellidae
Subfamily: Deltocephalinae
Colladonus flavocapitatus (Van Duzee 1890f: 80 )
References
Nielson, M. W. 1968b. The leafhopper vectors of phytopathogenic viruses (Homoptera, Cicadellidae). Taxonomy, biology and virus transmission. United States Department of Agriculture Technical Bulletin . 1382 386 pp.
Record last updated - 12/09/2019