University of California

Factors affecting curly-top infectivity of the beet leafhopper, Eutettix tenellus


Henry H. P. Severin

Author Affiliations

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

Publication Information

Hilgardia 12(8):497-530. DOI:10.3733/hilg.v12n08p497. September 1939.

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A number of investigators have called attention to the fact that large numbers of beet leafhoppers, Eutettix tenellus (Baker), collected in the foothill breeding areas and on weeds in the cultivated areas, failed to transmit the curly-top virus to sugar beets. There have been occasional reports in the literature of large populations of leafhoppers in beet fields with a small amount of curly top developing during the season.

Smith and Boncquet (23)3 tested fully 2,000 beet leafhoppers taken on Atriplex tularensis and Chenopodium album in the Tulare Lake region of the San Joaquin Valley upon several hundred sugar-beet plants without the production of curly top in a single instance.

Boncquet and Hartung (1) report that 100 leafhoppers collected on species of Artemisia and Atriplex in the Tulare Lake region and confined singly in cages on beet seedlings failed to produce curly top. Hartung (5), in a detailed paper on the results of the same experiment, states that 87 insects were tested and that 7 per cent “probable” cases of curly top developed. These “probable” cases of curly top showed one or more slightly curled leaves, but no reliable symptoms of the disease, such as wartlike protuberances on the lower surface of the leaves.

Literature Cited

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[6.] Hartung W. J. Evasion of curly-leaf disease or “blight. 1924. 6: Bureau Mo: Monterey Co. [California] Farm. p. 14-17.

[7.] Lackey C. F. Restoration of virulence of attenuated curly-top virus by passage through Stellaria media. Jour. Agr. Research. 1932. 44:755-65.

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[9.] Robbins W. W., Price Charles. Sugar-beet production in California. California Agr. Exp. Sta. Cir. 1936. 95:74-75.

[10.] Severin H. H. P. Investigations of beet leafhopper, Eutettix tenellus (Baker) in Salinas Valley of California. Jour. Econ. Ent. 1923. 16:479-85.

[11.] Severin H. H. P. Curly leaf transmission experiments. Phytopathology. 1924. 14:80-93. (Summary) 123.

[12.] Severin H. H. P. Crops naturally infected with sugar-beet curly top. Science. 1927. 66:137-38. DOI: 10.1126/science.66.1701.137 [CrossRef]

[13.] Severin H. H. P. Transmission of tomato yellows, or curly top of the sugar beet, by Eutettix tenellus (Baker). Hilgardia. 1928. 3(10):251-74. (Out of print.) DOI: 10.3733/hilg.v03n10p251 [CrossRef]

[14.] Severin H. H. P. Additional host plants of curly top. Hilgardia. 1929. 3(20):595-629. (Out of print.) DOI: 10.3733/hilg.v03n20p595 [CrossRef]

[15.] Severin H. H. P. Life history of beet leafhopper, Eutettix tenellus (Baker) in California. Univ. California Pubs. Ent. 1930. 5:595-636.

[16.] Severin H. H. P. Field observations on the beet leafhopper, Eutettix tenellus, in California. Hilgardia. 1933. 7(8):281-360. DOI: 10.3733/hilg.v07n08p281 [CrossRef]

[17.] Severin H. H. P. Weed host range of curly top and overwintering of curly-top virus. Hilgardia. 1933. 8(8):262-80. DOI: 10.3733/hilg.v08n08p261 [CrossRef]

[18.] Severin H. H. P., Basinger A. J. Facts concerning natural breeding areas of beet leafhoppers, Eutettix tennellus (Baker) in San Joaquin Valley of California. Jour. Econ. Ent. 1922. 6:411-19.

[19.] Severin H. H. P., Henderson C. F. Some host plants of curly top. Hilgardia. 1928. 3(13):339-92. (Out of Print.) DOI: 10.3733/hilg.v03n13p339 [CrossRef]

[20.] Severin H. H. P., Schwing E. A. The 1925 outbreak of the beet leafhopper, Eutettix tenellus (Baker) in California. Jour. Econ. Ent. 1926. 19:478-83.

[21.] Severin H. H. P., Freitag J. H. Some properties of the curly-top virus. Hilgardia. 1933. 8(1):1-48. (Out of print.) DOI: 10.3733/hilg.v08n01p001 [CrossRef]

[22.] Severin H. H. P., Freitag J. H. Ornamental flowering plants naturally infected with curly-top and aster-yellows viruses. Hilgardia. 1933. 8(8):233-60. DOI: 10.3733/hilg.v08n08p233 [CrossRef]

[23.] Smith R. E., Boncquet P. A. Connection of a bacterial organism with curly leaf of the sugar beet. Phytopathology. 1915. 5:335-42.

Severin H. 1939. Factors affecting curly-top infectivity of the beet leafhopper, Eutettix tenellus. Hilgardia 12(8):497-530. DOI:10.3733/hilg.v12n08p497
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