Scaphytopius irroratus (van Duzee 1910a: 227 )Membracoidea : Cicadellidae
|Diseases Transmitted||Pathogen Type|
|Western X-disease phytoplasma 16SrIII-A||Phytoplasma|
|Crops Affected by Scaphytopius irroratus (van Duzee 1910a: 227 )|
This species is a vector of the western strain of North American aster yellows virus. First reported as a vector by Severin (701) in 1947, the insect infected both celery and aster after completing nymphal development on diseased celery. Percent transmission to aster varied from 10 to 19, all infected by males. There were no transmissions by females. Retention of the virus was determined as 15 days in a single male. Attempts to transmit curly top virus of sugarbeets and Pierce’s disease virus of grape with this species failed.
This species is not considered an important vector in the spread of this virus in California.
Small, linear Species. male 3.30—3.60 mm., female 3.50—3.80 mm.
General colour light brown. Crown with brown longitudinal striations; pronotum reticulated; elytra with numerous brown reticulations interspersed with circular ivory spots.
Pygofer in lateral aspect about 11/2 times as long as wide, caudodorsal margin produced posteriorly to convex lobe; aedeagus in lateral aspect with basal extension, shaft slightly curved, tubelike, with pair of terminal projections extending laterally in ventral aspect; gonopore apical; style in dorsal aspect simple, apex narrowed; female seventh sternum in ventral aspect with caudal margin broadly convex.
species is similar to
in general habitus and can easily be distinguished by the male genitalia, which lack the aedeagal paraphyses. This is the only species among vectors in the genus that lacks these structures.
|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.|