University of California

Transmission of California aster-yellows virus by leafhopper species in Thamnotettix group


Henry H. P. Severin

Author Affiliations

Henry H. P. Severin was Entomologist in the Experiment Station.

Publication Information

Hilgardia 18(4):201-216. DOI:10.3733/hilg.v18n04p201. April 1948.

PDF of full article, Cite this article


Abstract does not appear. First page follows.


According to (Ball (1936)),3 the tree- and shrub-inhabiting leafhoppers have been referred in the past to the genus Thamnotettix, but are widely separated from the type of the genus and belong to a number of distinct genera. He divided the genus into nine genera.

Some years ago three leafhopper species (Severin, 1929), (1934) and a biological race (Severin, 1940) of one of these species were reported to transmit California aster-yellows virus. In recent papers (Severin, 1945), (1946), (1947a), (1947b) thirteen more species have been added to the list of vectors of this virus. The present paper deals with nine species and one variety of leafhoppers in the Thamnotettix group, two of which have been previously recorded in the literature (Severin, 1934). All were tested for transmission of California aster-yellows virus and some for transmission of the viruses of curly top and Pierce’s disease of the grapevine. The companion paper in this issue (DeLong and Severin, 1948) discusses the characters, distribution, and food plants of eight of these leafhopper species.


The cages used and the methods of transferring leafhoppers in a dark chamber were the same as in previous investigations (Severin, 1930), (1931).

The food plants used in maintaining large populations of the geminate leafhopper, Colladonus geminatus (Van Duzee), and the mountain leafhopper, C. montanus (Van Duzee), have been recorded in previous papers (Severin, 1934), (1942). Infective Idiodonus heidemanni (Ball) was reared on diseased celery and asters and noninfective leafhoppers on healthy celery and asters. The other six species and the one variety in the Thamnotettix group were collected on their natural host plants. They were not reared on celery and asters, and no attempt was made to breed them on their natural host plants.

Idiodonus Heidemanni (Ball)

Transmission of Virus to Celery. To determine the efficiency of Idiodonus heidemanni (Ball) (= Thamnotettix heidemanni Ball) in transmitting California aster-yellows virus, 50 males and 50 females that had completed the nymphal stages on infected celery were transferred singly to healthy celery plants. As table 1 shows, 12 per cent of the males and 20 per cent of the females caused infections.

Literature Cited

Ball E. D. Additions to the western Jassid fauna. Canad. Ent. 1900. 32:337-47. DOI: 10.4039/Ent32337-11 [CrossRef]

Ball E. D. Additions to the Jassid fauna of N. A. (Homoptera). Canad. Ent. 1911. 43:197-204. DOI: 10.4039/Ent43197-6 [CrossRef]

Ball E. D. Some new genera of leafhoppers related to Thamnotettix. Brooklyn Ent. Soc. Bul. 1936. 31:57-60.

DeLong D. M., Severin H. H. P. Characters, distribution, and food plants of leafhopper species in Thamnotettix group. Hilgardia. 1948. 18(4):185-99. DOI: 10.3733/hilg.v18n04p185 [CrossRef]

Rapp W. F. Some new North American Pipunculidae (Diptera). Ent. News. 1943. 54(9):222-24.

Severin H. H. P. Yellows disease of celery, lettuce, and other plants, transmitted by Cicadula sexnotata (Fall). Hilgardia. 1929. 3(18):543-83. DOI: 10.3733/hilg.v03n18p543 [CrossRef]

Severin H. H. P. Life-history of beet leafhopper, Eutettix tenellus (Baker) in California. Univ. California Pubs. Ent. 1930. 5:37-88.

Severin H. H. P. Modes of curly-top transmission by the beet leafhopper, Eutettix tenellus (Baker). Hilgardia. 1931. 6(8):253-76. DOI: 10.3733/hilg.v06n08p253 [CrossRef]

Severin H. H. P. Transmission of California aster and celery-yellows by three species of leafhoppers. Hilgardia. 1934. 8(10):339-61. DOI: 10.3733/hilg.v08n10p337 [CrossRef]

Severin H. H. P. Potato naturally infected with California aster yellows virus. Phytopathology. 1940. 30(12):1049-51.

Severin H. H. P. Infection of perennial delphiniums by California-aster-yellows virus. Hilgardia. 1942. 14(8):411-40. DOI: 10.3733/hilg.v14n08p411 [CrossRef]

Severin H. H. P. Evidence of nonspecific transmission of California aster-yellows virus by leafhoppers. Hilgardia. 1945. 17(1):21-59. DOI: 10.3733/hilg.v17n01p021 [CrossRef]

Severin H. H. P. Transmission of California aster-yellows virus by the first reported leafhopper vector in Gyponinae. Hilgardia. 1946. 17(3):139-53. DOI: 10.3733/hilg.v17n03p139 [CrossRef]

Severin H. H. P. Acinopterus angulatus, a newly discovered leafhopper vector of California aster-yellows virus. Hilgardia. 1947a. 17(5):197-209. DOI: 10.3733/hilg.v17n05p197 [CrossRef]

Severin H. H. P. Newly discovered leafhopper vectors of California aster-yellows virus. Hilgardia. 1947b. 17(16):511-23. DOI: 10.3733/hilg.v17n16p511 [CrossRef]

Severin H. 1948. Transmission of California aster-yellows virus by leafhopper species in Thamnotettix group. Hilgardia 18(4):201-216. DOI:10.3733/hilg.v18n04p201
Webmaster Email: sjosterman@ucanr.edu