Cuerna costalis (Fabricius 1803a: 4)Membracoidea : Cicadellidae
|Diseases Transmitted||Pathogen Type|
|Crops Affected by Cuerna costalis (Fabricius 1803a: 4)|
This species is a vector of phony peach disease virus and Pierce’s disease virus of grape in Georgia. In 1949, Turner (792) first reported the transmission of phony peach disease virus in tests at Fort Valley, Ga. The efficiency of the vector was only 24.7 percent (Turner and Pollard 1955) . Results of studies on the acquisition feeding period in the vector varied, but the species was able to acquire virus after 1 day on the source of inoculum. The latent period of the virus in the body of the vector varied from 5 to 12 days and in some individuals longer. Retention of the virus lasted from 91 to 152 days, and some individuals retained the virus after spending 54 days on a nonsusceptible host plant.
Kaloostian et al, in 1962 (408) also reported this species as a vector of Pierce’s disease virus in Georgia. One positive inoculation was obtained after a 3-day virus acquisition and 21- to 105-day transmission feeding periods.
This species is not considered an important vector in the natural spread of these viruses owing to its primary association with grasses and herbaceous plants and low efficiency in transmitting the viruses.
Large, robust species. Length of male 7.70—9.10 mm., female 8.20—9.60 mm.
General color, reddish black to black with prominent yellow or ivory band running laterally from anterior margin of head to eighth tergum; head, pronotum, and scutellum black with numerous coarse yellow markings.
Pygofer in lateral aspect about 11/3 times longer than wide, caudal margin convex; aedeagus in lateral aspect excluding atrial processes about 11/4 times longer than wide, shaft projecting posterodorsad with prominent tooth on each side of middle in caudal aspect; lateral atrial processes recurved, basal half projecting dorsad, apical half projecting caudad or ventrad, recurved part not exceeding apex of aedeagal shaft but extending caudad to or beyond caudal margin of atrium, curved slightly mesad in caudal aspect; caudal atrial processes long, slightly narrower than lateral atrial processes, nearly straight, projecting slightly anterodorsad beyond apex of aedeagal shaft, usually crossing over in caudal aspect; female eighth sternum in dorsal aspect single, broad, bellshaped plate about 11% times longer than seventh tergum; plate with anterior margin broad, lateral margins divergent laterad and broadly convex, caudal margin twice as broad as anterior margin and broadly concave or truncate and sinuate along middle.
to which it is similar in male genital characteristics,
can be distinguished by the female eighth sternum, which has a single broad, bell-shaped plate, and by its geographical distribution.
|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.|