Colladonus kirkaldyi (Ball 1911a: 197 )

Published in: Ball, E.D. (1911a) Additions to the jassid fauna of North America (Homoptera). The Canadian Entomologist 43, 197–204.

Description & Identification

Small, slightly robust species. Length of male 3.50—3.70 mm., female 3.70—4.00 mm. (Nielson, 1968)General colour light grey. Crown grey to light brown with two black spots on anterior margin and black spot next to inner margin of each eye, two small brown spots along posterior margin; pronotum grey to light brown, sometimes with few spots along anterior border; elytra streaked with grey and brown, veins grey.(Nielson, 1968)Pygofer in lateral aspect about 1½ times as long as wide, ventral margin concave about middle, caudal margin triangularly convex, dorsal margin with distal part convex; pygofer spine with many minute setae; caudodorsal and dorsal submarginal areas with many long setae; aedeagus in lateral aspect with bifurcate processes more than one-half as long as aedeagal shaft, flat, narrow throughout, pointed apically, crossing in dorsal aspect; gonopore of aedeagus basad of midlength of shaft; style in dorsal aspect about 1½ times as long as connective; stylar shaft robust, about twice as long as basal width, sides not parallel, expanded apically; stylar spine apical, sharply pointed, projecting laterally; female seventh sternum in ventral aspect slightly more than twice as wide as long, lateral margins parallel, posterior margin acutely convex on each side of median spatulate process; median emargination V-shaped, shallow, less than one-half length of segment; spatulate process short, slightly longer than wide, produced slightly beyond posterior marginal extremity, with sides parallel, apex truncate (Nielson, 1968)This species is rather distinctive in general habitus and male genital characteristics from all other vector species of Colladonus. The pygofer spine is short and curved and arises from the middle of the caudal margin of the pygofer and separates it from other species. Nielson (561) presented further elucidations of the genitalia and Severin (704) illustrated the adults in color. (Nielson 1968)

Biology & Ecology

Little is known on the biology of this species. DeLong and Severin (196) took specimens from California sagebrush (Artemisia californica Less.), which is presumably its natural host. (Nielson, 1968)


(Ball 1911a: 197 )


Idiodonus kirkaldyi (Ball, 1911)
Thamnotettix kirkaldyi Ball, 1911
Thamnotettix kirkaldyi Ball, 1911

Worldwide Distribution

It occurs in northern Mexico and California. DeLong and Severin (196) collected specimens from San MateoCounty. Specimens were examined from Tijuana, Mexico, and DelMar, La Jolla, La Mesa, Lucerne, Miramar, Montara, Salinas, SanDiego, San Francisco, Santa Cruz, Santa Margarita, StinsonBeach, and Watsonville, Calif., by Nielson (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 yellows virus. It was first reported as a vector by Severin (701, 703, 740) under the name of 'Idiodonus kinlcaldyi (Ball) .' It was not an efficient vector of the virus as evidenced by the number of failures in transmitting the virus. Only two of seven celery plants tested became infected after the insects fed for 66 days on diseased celery.(Nielson 1968)This species at present is not considered an important vector of this virus in California.(Nielson 1968)

Plant Diseases


Athysanini Cicadellidae Colladonus Deltocephalinae Membracoidea North America

Colladonus kirkaldyi (Ball 1911a: 197 ): Wilson M. R. & Turner J. A. 2021. Insect Vectors of Plant Disease. Amgueddfa Cymru - National Museum Wales. Available online at [ Accessed:  07/12/2022 ].
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