University of California

Curly top symptoms in an inoculated cotyledon of the sugar beet


Katherine Esau

Author Affiliations

Katherine Esau was Professor of Botany and Botanist in the Experiment Station, Davis.

Publication Information

Hilgardia 27(1):1-14. DOI:10.3733/hilg.v27n01p001. September 1957.

PDF of full article, Cite this article


Virus of curly top disease was introduced, through one cotyledon, into seedlings of a highly susceptible sugar beet strain. The inoculated cotyledon developed phloem hyperplasia—abnormal multiplication of cells—characteristic of the curly top disease. This symptom was observed in the main vein and some small veins on the third day after inoculation. In many samples, the main vascular bundle also showed pronounced necrotic obliteration in the older part of the phloem tissue, a symptom not previously described for curly top infection.

Noninoculated cotyledons collected twelve days after inoculation of the experimental seedlings had developed no curly top symptoms.

Literature Cited

Artschwager E. F. Anatomy of the vegetative organs of the sugar beet. Jour. Agr. Res. 1926. 33:143-76.

Eames A. J. Destruction of phloem in young bean plants after treatment with 2,4-D. Amer. Jour. Bot. 1950. 37:840-47. DOI: 10.2307/2437763 [CrossRef]

Esau K. Pathologic changes in the anatomy of leaves of the sugar beet, Beta vulgaris L., affected by curly top. Phytopathology. 1933. 23:679-712.

Esau K. Initial localization and subsequent spread of curly-top symptoms in the sugar beet. Hilgardia. 1935. 9(8):397-436. DOI: 10.3733/hilg.v09n08p395 [CrossRef]

Esau K. Phloem anatomy of tobacco affected with curly top and mosaic. Hilgardia. 1941. 13(8):437-90. DOI: 10.3733/hilg.v13n08p435 [CrossRef]

Esau K. Phloem degeneration in Gramineae affected by the barley yellow-dwarf virus. Amer. Jour. Bot. 1957. 44:245-51. DOI: 10.2307/2438806 [CrossRef]

Girolami G. Comparative anatomical effects of the curly-top and aster-yellows viruses on the flax plant. Bot. Gaz. 1955. 116:305-22. DOI: 10.1086/335876 [CrossRef]

Schneider H. Anatomy of buckskin-diseased peach and cherry. Phytopathology. 1945. 35:610-35.

Schneider H. Effect of trunk girdling on phloem of trunk of sweet orange trees on sour orange rootstock. Hilgardia. 1954. 22(16):593-601. DOI: 10.3733/hilg.v22n16p593 [CrossRef]

Esau K. 1957. Curly top symptoms in an inoculated cotyledon of the sugar beet. Hilgardia 27(1):1-14. DOI:10.3733/hilg.v27n01p001
Webmaster Email: sjosterman@ucanr.edu