University of California

An interspecific hybrid in Allium


S. L. Emsweller
H. A. Jones

Authors Affiliations

S. L. Emsweller was Assistant Professor of Truck Crops and Assistant Olericulturist in the Experiment Station; H. A. Jones was Professor of Truck Crops and Olericulturist in the Experiment Station.

Publication Information

Hilgardia 9(5):265-273. DOI:10.3733/hilg.v09n05p265. March 1935.

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Porter and Jones,(5) testing several varieties of Allium cepa L. and other species of the same genus, found that the Nebuka, a type of A. fistulosum, was markedly resistant to pinkroot, caused by Phoma terrestris Hansen, and showed no indication of injury when grown continuously for several years in heavily infested soil. Felix(2) has also reported that varieties of A. fistulosum, namely Winterhecke and White Welsh as well as different strains of Nebuka (Natsu-negi Nebuka, Sinju negi Nebuka, Tokyo-Nebuka, Itwatsuki), are resistant to pinkroot. In addition, he states that the different strains of Nebuka are highly resistant to smut, caused by Urocystis cepulae Frost: although under favorable conditions, infection frequently averaged 10 to 20 per cent in the cotyledon stage, it always fell to 0.5 per cent or less in later counts. Anderson(1) also reports that the variety Winterhecke is resistant to smut. In a letter dated December 6, 1932, Professor A. G. Newhall of Cornell University states that seedlings from Nebuka seed grown at Davis, California, were practically immune to smut.

In a recent paper, Jones, Bailey, and Emsweller(4) have shown that the Nebuka onion is also resistant to thrips, having a smaller number per plant than any other onion variety except White Persian, which it somewhat resembles in foliage characters, especially the circular leaves, spreading habit of growth, and long sheath region.

Literature Cited

[1] Anderson P. J. Comparative susceptibility of onion varieties and species of Allium to Urocystis cepulae. Jour Agr. Research. 1925. 31:275-286.

[2] Felix E. L. Disease resistance in Allium fistulosum L. Phytopathology. 1933. 23:109-110.

[3] Jones H. A., Emsweller S. L. Methods of breeding onions. Hilgardia. 1933. 7(16):625-642. DOI: 10.3733/hilg.v07n16p625 [CrossRef]

[4] Jones H. A., Bailey S. F., Emsweller S. L. Thrips resistance in the onion. Hilgardia. 1934. 8(7):213-232. DOI: 10.3733/hilg.v08n07p197 [CrossRef]

[5] Porter D. R., Jones H. A. Resistance of some of the cultivated species of Allium to pinkroot (Phoma terrestris Hansen). Phytopathology. 1933. 23:290-298.

Emsweller S, Jones H. 1935. An interspecific hybrid in Allium. Hilgardia 9(5):265-273. DOI:10.3733/hilg.v09n05p265

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