Colladonus flavocapitatus (Van Duzee 1890f: 80 )


Description & Identification

Medium size, linear species. Length of male 4.30—4.60 mm., female 4.80—5.00 mm. (Nielson, 1968)General color yellowish brown. Crown and pronotum yellowish brown to ivory, immaculate; elytra light brown, veins ivory or yellow.(Nielson, 1968)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 (Nielson, 1968)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)


Biology & Ecology

The biology of this species is not well known. Host plants reported by DeLong and Severin in 1948 (196) were California blackberry (Rubus vitifolius Cham. & Schlecht.), bush lupine (Lupinus arboreus Sims), monkeyflower (Diplctcus aurantiacus Jeps.), bracken (Pteridium aquitinum var. lanuginosum (Bon?.) Fern.), Allepo pine (Pinus halepensis Mill.), and Japanese ivy (Parthenocissus tricuspidata (Sieb. & Zucc.) Planch.). Several specimens were trapped on peach in Utah by Nielson and Kaloostián in 1956 (568). (Nielson, 1968)


Classification

Hemiptera
Auchenorrhyncha
Cicadellidae
Deltocephalinae
Athysanini
Colladonus
flavocapitatus
(Van Duzee 1890f: 80 )

Worldwide Distribution

It occurs in western. Nearctic America. In 1948 DeLong and Severin (196) reported this species under the name 'Colladonus commissus (Van Duzee)” from Montara, San Mateo County, Calif. Specimens were examined from California, Colorado, Oregon, Utah, Washington, Alberta, British Columbia, and Alaska by Nielson in 1957 (561). (Nielson, 1968)

North America

Distribution point data provided by GBIF.

Vector Status

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)

Plant Diseases


GALLERY



TAGS
Athysanini Cicadellidae Colladonus Deltocephalinae Membracoidea North America
RESOURCES

CITATION
Colladonus flavocapitatus (Van Duzee 1890f: 80 ): Wilson M. R. & Turner J. A. 2021. Insect Vectors of Plant Disease. Amgueddfa Cymru - National Museum Wales. Available online at http://insectvectors.science/vector/1686. [ Accessed:  28/11/2021 ].
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