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Species Account



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Excultanus incurvatus (Osborn & Lathrop 1923a: 346 )

Membracoidea : Cicadellidae
Diseases Transmitted

Distribution Map
(simplified continental distribution)
Geographical Distribution:

Recorded Distribution(s):
This species is found in the Southwestern Unit¬ed States and northwestern Mexico. In 1950, DeLong and Severin (198) reported it from Arizona, California, and the States of Sonora and Jalisco, Mexico. An additional locality recorded by Crowder in 1952 (149) was New Mexico. (Nielson, 1968)

Excultanus incurvatus (Osborn & Lathrop 1923a: 346 )
Diseases Transmitted Pathogen Type
Crops Affected by Excultanus incurvatus (Osborn & Lathrop 1923a: 346 )
Rice Citrus Carrot
Barley Apple Tomato
Maize (Corn) Pear Potato
Sugarcane Elm Strawberry
Wheat Palms Rubus
Sorghum Grapevine Papaya
Other (grasses/cereals) Ornamentals Peach

This species is a vector of the western strain of North American aster yellows virus. First reported by Severin in 1950 (707), this species transmitted the virus from diseased celery to healthy celery and aster plants. Transmission to celery was 22 percent and to aster 1 percent. The virus was retained from 11 to 22 days by males and 29 to 44 days by females.
(Nielson 1968)

This species is considered a potentially important vector in the spread of this virus in California
(Nielson 1968)

Identification Plates
Excultanus incurvatus


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Plate 1
Species Description

Length:
Medium size, slightly robust species. Length of male 5.70—6.20 mm., female 5.70—6.00 mm.

Colour:
General color tannish brown with numerous, dark reticulations on body. Crown and pronotum tan, suffused with light brown; elytra ivory with numerous tan and dark reticulations.

Genitalia:
Pygofer in lateral aspect about 1% times as long as wide, caudodorsal margin produced dorsally to convex lobe; aedeagus in lateral aspect recurved, tubelike, attenuated apically, apex notched in ventral aspect; gonopore apical; style in dorsal aspect with broad, curved apices; female seventh sternum in ventral aspect with caudal margin deeply and broadly concave.

Species Diagnosis

This is the only species in the genus Excultanus that is a vector. It can be distinguished from other vector species by the key to the genera. Crowder (1952) , illustrated the genitalia, and Severin (1950 gave colour plates of the nymphs and adults.

(Nielson 1968)

Ecology

Host Plant Activity Period (Months) Dormancy Generations
- -
Eggs -
Nymphs -
Adult -
One per year -
Continuous -
Variable -
Excultanus incurvatus (Osborn & Lathrop 1923a: 346 )

Higher taxonomy

Kingdom Phylum Class Order Superfamily Family
Animalia Arthropoda Insecta Hemiptera
Suborder: Auchenorrhyncha
Infraorder: Cicadamorpha
Membracoidea Cicadellidae
Subfamily: Deltocephalinae
Excultanus incurvatus (Osborn & Lathrop 1923a: 346 )
References
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.
Record last updated - 12/09/2019