Colladonus holmesi Bliven 1954a: 116


Description & Identification

Medium size, linear species. Length of male 4.7—5.4 mm., female 5.3—6.1 mm. (Nielson, 1968)General color yellow brown. Crown yellow brown, immaculate; pronotum and scutellum yellow brown; elytra light golden brown, translucent.(Nielson, 1968)Pygofer in lateral aspect about 1% times as long as wide, ventral margin slightly concave about middle, caudoventral margin produced posteriorly to distinct lobe, caudodorsal margin nearly straight, dorsal margin with distal part convex; pygofer spine well developed, long, straight, lanceolate, arising from apex of caudoventral lobe, projecting posterodorsally; caudodorsal submarginal area of pygofer with many long setae; style in dorsal aspect about 1½ times as long as connective; stylar shaft robust, short, about twice as long as wide, with sides parallel, apex truncate; stylar spine apical, long, attenuated apically, projecting laterally; aedeagus with bifurcate processes about one-half as long as aedeagal shaft, flat, narrow, attenuated apically, crossing in dorsal view; gonopore basad of midlength of shaft; female seventh sternum in ventral aspect about twice as wide as long, anterolateral margins parallel, posterolateral margins curved mesally, posterior margin truncate on each side of median spatulate process; median emargination U-shaped, deep, slightly less than one-half length of segment; spatulate process narrow, about twice as long as wide, produced slightly beyond posterior margin, with sides parallel, apex bifid. (Nielson, 1968)From fiavocapitatus, to which it is similar in general habitus, holmesi can be distinguished by the male pygofer with caudoventral margin produced posteriorly to a distinct lobe and the aedeagus with the gonopore basad of midlength of the shaft. (Nielson 1968)


Biology & Ecology

Little is known on the biology of this species. Bliven (96) collected specimens from redwood (Sequoia sempervirens (Lamb.) EndI.). It has also been reported from Aretostaphylos manzanita Parry, A. tomentosa (Pursh) Lindl., and A. andersonii Gray (Nielson, 561). DeLong and Severin (196) swept specimens from wild gooseberry (Ribes sp.), R. cereum Dougl., and R. roezli Regel. I have collected numerous specimens of nymphs and adults from wild currant (I?. cereum). (Nielson, 1968)


Classification

Hemiptera
Auchenorrhyncha
Cicadellidae
Deltocephalinae
Athysanini
Colladonus
holmesi
Bliven 1954a: 116

Worldwide Distribution

It occurs in the Western United States. Nielson (561) recorded it from several localities in California. I have collected numerous specimens from Rock Creek Canyon near Twin Falls, Idaho. (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 of this virus under the name 'Colladonus fiavocapitatus” by Severin (701, 703, 704). Transmission was effected from diseased celery to four healthy celery plants after adults fed 11 to 17 days on the inoculum.(Nielson 1968)At the present time, this species is not considered an important vector in the natural spread of this virus. In view of the confusion in identification of the species, further transmission experiments are recommended to confirm the identity of the proper vector species.(Nielson 1968)

Plant Diseases


GALLERY



TAGS
Athysanini Cicadellidae Colladonus Deltocephalinae Membracoidea North America
RESOURCES

CITATION
Colladonus holmesi Bliven 1954a: 116 : Wilson M. R. & Turner J. A. 2021. Insect Vectors of Plant Disease. Amgueddfa Cymru - National Museum Wales. Available online at http://insectvectors.science/vector/1709. [ Accessed:  28/11/2021 ].
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