Xyphon triguttata (Nottingham 1932a: 108)Membracoidea : Cicadellidae
|Diseases Transmitted||Pathogen Type|
|Crops Affected by Xyphon triguttata (Nottingham 1932a: 108)|
This species is a Vector of Pierce’s disease virus of grape in California. Frazier (273) was first to report it as a vector of this virus in 1944. Confirmation studies were reported by Frazier and Freitag in 1946 (275), who effected transmission of the virus from diseased grape to healthy grape and alfalfa and from diseased alfalfa to healthy grape and alfalfa. Forty-two percent of the test plants were infected. Natural infectivity of the vector was demonstrated by Freitag and Frazier in 1954 (286) from specimens collected from grass in the Coachella Valley. Percent infectivity was only 6.3.
This species is not considered an important vector of Pierce’s disease virus of grape owing to its restricted geographical range and disassociation with vineyards
Medium size, slender species. male 3.90—4.20 mm., female 4.40—5.00 mm.
General color green with pronounced venation on elytra. Crown light green with distinct triangular black spot on middle; pronotum green; elytra dark green with apex weakly reticulated, veins light yellowish green.
Pygofer in lateral aspect about 1% times as long as wide, caudodorsal margin produced posteriorly to rounded lobe, dorsal margin slightly concave; aedeagus in lateral aspect simple, shaft broad basally, narrowly attenuated distally in lateral aspect, narrow, tubelike in ventral aspect, small distinct tooth basally on dorsal surface; gonopore apical; aedeagal processes symmetrical; style in dorsal aspect simple, distal one-third curved laterally and attenuated; female seventh sternum in ventral aspect with caudal margin somewhat triangulate or obtusely angled, notched at middle.
species is similar to
in genital characteristics and can be distinguished by the aedeagus with the shaft nearly tube-like in ventral aspect.
|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.|