University of California

Ornamental flowering plants naturally infected with curly-top and aster-yellows viruses


Henry H. P. Severin
Julius H. Freitag

Authors Affiliations

Henry H. P. Severin was Associate Entomologist in the Experiment Station; Julius H. Freitag was Research Assistant in the Experiment Station.

Publication Information

Hilgardia 8(8):233-260. DOI:10.3733/hilg.v08n08p233. September 1934.

PDF of full article, Cite this article


Abstract does not appear. First page follows.


A few of the virus diseases have been experimentally transmitted to many species of plants in different genera. of many families. The host range of virus diseases as determined by experimental infection often does not coincide with the food and breeding plants preferred by the insect vector of the disease under natural conditions: preferred food and breeding plants of the insect under field conditions are sometimes immune to virus diseases; and the insect cannot live for more than a few days in captivity on some host plants that are highly susceptible to virus diseases in the natural environment. A review of the literature on the host range of certain virus diseases as determined by experimental and natural infection follows.

Kunkel(8),(9) reported that he experimentally transmitted aster yellows with Cicadula divisa Uhl. to 170 species in 150 genera belonging to 38 families. He transmitted the disease to asters from 40 different species of plants experimentally infected with yellows. There is no record of the natural occurrence of yellows on most of the plants experimentally infected with the disease. Three methods were used by him in determining whether a plant was naturally infected with yellows. In the first method the virus was recovered by previously noninfective leafhoppers from the naturally infected plants and transferred to asters.

Literature Cited

[1] Bald J. G., Samuel G. Investigations on “spotted wilt” of tomatoes. Aust. Council for Sci. and Indus. Research. Bul. 1931. 54:1-24.

[2] Carsner E. Susceptibility of various plants to curly top. Phytopathology. 1919. 9:413-421.

[3] Freitag J. H., Severin H. H. P. List of ornamental flowering plants experimentally infected with curly top. Plant Disease Reporter. 1933. 17:2-5. [Issued by the U. S. Dept. Agr. Bur. Plant Indus.]

[4] Fromme F. D., Wingard S. A. Blackfire or angular-leafspot of tobacco. Virginia Agr. Exp. Sta. Tech. Bul. 1922. 25:1-43.

[5] Henderson G. R. Transmission of tobacco ringspot by seed of petunia. Phytopathology. 1931. 21:225-229.

[6] Henderson G. R. Further studies on tobacco ringspot in Virginia. Jour. Agr. Research. 1931. 43:191-207.

[7] Johnson E. M. Virus diseases of tobacco in Kentucky. Kentucky Agr. Exp. Sta. Bul. 1930. 306:287-415.

[8] Kunkel L. O. Studies on aster yellows. Amer. Jour. Bot. 1926. 13:646-705. DOI: 10.2307/2435474 [CrossRef]

[9] Kunkel L. O. Studies on aster yellows in some new host plants. Boyce Thompson Inst. Contrib. 1931. 3:85-123.

[10] McKay M. B. The curly top disease. Seed World. 1928. 23:3848- 72

[11] Priode C. N. Further studies on the ringspot disease of tobacco. Amer. Jour. Bot. 1928. 15:88-93. DOI: 10.2307/2435865 [CrossRef]

[12] Severin H. H. P. Crops naturally infected with sugar beet curly-top. Science. 1927. 66:137-138. 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):251-274. DOI: 10.3733/hilg.v03n10p251 [CrossRef]

[14] Severin H. H. P. Yellows disease of celery, lettuce, and other plants, transmitted by Cicadula sexnotata (Fall. Hilgardia. 1929. 3(18):543-582. DOI: 10.3733/hilg.v03n18p543 [CrossRef]

[15] Severin H. H. P. Additional host plants of curly top. Hilgardia. 1929. 3(20):595-636. DOI: 10.3733/hilg.v03n20p595 [CrossRef]

[16] Severin H. H. P. Curly-top symptoms on the sugar beet. California Agr. Exp. Sta. Bul. 1929. 465:1-35. http://archive.org/details/curlytopsymptoms465seve

[17] Severin H. H. P., Freitag J. H. List of ornamental flowering plants naturally infected with curly top or yellows diseases in California. Plant Disease Reporter. 1933. 17:1-2. [Issued by the U. S. Dept. Agr. Bur. Plant Indus.]

[18] Severin H. H. P., Henderson C. F. Some host plants of curly top. Hilgardia. 1928. 3(13):339-392. DOI: 10.3733/hilg.v03n13p339 [CrossRef]

[19] Smith K. M. Thrips tabaci Lind. as a vector of plant virus disease. Nature [London]. 1931. 127(3214):852-853. DOI: 10.1038/127852a0 [CrossRef]

[20] Smith K. M. Studies on potato virus diseases. VIII. On a ringspot virus affecting solanaceous plants. Ann. Appl. Biol. 1931. 18:1-15. DOI: 10.1111/j.1744-7348.1931.tb02280.x [CrossRef]

[21] Smith K. M. Studies on plant virus diseases. XI. Further experiments with a ringspot virus: its identification with spotted wilt of the tomato. Ann. Appl. Biol. 1932. 19:305-330. DOI: 10.1111/j.1744-7348.1932.tb04326.x [CrossRef]

[22] Wingard S. A. Host and symptoms of ringspot, a virus disease of plants. Jour. Agr. Research. 1928. 37:127-153.

[23] Wingard S. A., Godkin J. Tobacco diseases in Virginia and their control. Virginia Agr. Ext. Bul. 1924. 90:1-31.

Severin H, Freitag J. 1934. Ornamental flowering plants naturally infected with curly-top and aster-yellows viruses. Hilgardia 8(8):233-260. DOI:10.3733/hilg.v08n08p233
Webmaster Email: sjosterman@ucanr.edu