An interspecific hybrid in Allium
AuthorsS. L. Emsweller
H. A. Jones
Authors AffiliationsS. 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.
Hilgardia 9(5):265-273. DOI:10.3733/hilg.v09n05p265. March 1935.
Abstract does not appear. First page follows.
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.
 Anderson P. J. Comparative susceptibility of onion varieties and species of Allium to Urocystis cepulae. Jour Agr. Research. 1925. 31:275-286.
 Felix E. L. Disease resistance in Allium fistulosum L. Phytopathology. 1933. 23:109-110.
 Jones H. A., Emsweller S. L. Methods of breeding onions. Hilgardia. 1933. 7(16):625-642. DOI: 10.3733/hilg.v07n16p625 [CrossRef]
 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]
 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.
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Costs of lumber production: Production costs in California have become vital factor in determining nation-wide use of lumber and its price level
Range cover after noxious weed: Desirable and undesirable grasses and forbs compete for range space cleared of Klamath weed by leaf-feeding beetles
Brush control with chemicals: Hormone-type sprays tested for use in brushland management prove most effective when applied to current year seedlings
Codling moth control sprays: New insecticides tested in field investigations in southern California for effectiveness against several pests of walnuts
Petal blight disease of azaleas: Control of fungus-caused disease of azaleas and closely related plants is essential to prevent its further spread
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Valencia orange size and 2,4-D: Adequate soil moisture important for increasing fruit sizes with 2,4-D sprays applied when fruits are 4–12 weeks old
Argentine ant control on citrus: Granular formulations of certain chlorinated hydrocarbons applied to soil surface show promise in preliminary trials
Orange fruit size and yield: 31-year study of interrelationship of temperatures and orange fruit size and yield indicates influence of some climatic factor
Meiosis in Allium fistulosum, Allium cepa, and their hybrid