Experiment Station Record, Volume 94, January-June, 1946 Page: 74
xi, 975 p. ; 24 cm.View a full description of this book.
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74 EXPERIMENT STATION RECORD [Vol 94
recent reports in the literature (18 references), are believed to substantiate the
hypothesis that the concentration of inoculum has a greater influence on the severity
of the symptoms than hitherto admitted. In the succeeding discussion the authors
endeavor to explain their results through the theory of autocatalytic virus multiplication
in infected plants.
Bunt reaction of hard red winter wheats in 1938-42, K. S. QUISENBERRY, H. A.
RODENHISER, and C. 0. JOHNSTON. (U. S. D. A. coop. Tex., Okla., Kans., Colo.,
Nebr., Minn., Mont., Utah, and W. Va. Expt. Stas.). (Jour. Amer. Soc. Agron.,
37 (1945), No. 7, pp. 514-522).-A large-number of varieties and strains of hard
red winter wheat were tested at several stations in the Great Plains, as well as in
West Virginia, Maryland, and Utah, the inoculum being a composite of collections
of Tilletia foetida and T. caries from fields selected at random throughout the State
in which the tests were made. No variety, proved free of bunt in all tests, but :a
number exhibited considerable resistance. Selections from such crosses as Hope
X Turkey 1069, H44 X Minturki, Ora X Tenmarq, Martin X Tenmarq, and
Blackhull X Oro were rather highly resistant. Since only bulk inoculum was
used, these tests should be looked on as preliminary. When tested with dwarf bunt
at Logan, Utah, four strains proved as resistant as Relief and eight as resistant as
Hussar. Most of these wheats had Hussar, Martin, or Ridit as one parent.
The effect of leaf rust on the yield and quality of wheat, B. PETURSON,
M. NEWTON, and A. G. O. WHITESIDE (Canad. Jour. Res., 23 (1945), No. 4, Sect. C,
pp. 105-114).-In field tests at Winnipeg, heavy artificially induced infection of leaf
rust (Puccinia triticina) in wheat reduced the yield, bushdl and kernel weights,
number of kernels per head, and percentage of flour yield of the varieties Thatcher,
Apex, Renown, and Regent. Infection increased the yellow pigment content of the
flour, but apart from a reduction in flour yield had no other adverse effect on the
milling and baking qualities of the grain; in fact, the milled flour proved superior
in baking strength to that from nonrusted samples. In the field, the rust had a
variable effect on the percentage of protein in the grain; in one year it increased,
in two other years it decreased, the protein percentage. In the greenhouse, during
two years, leaf rust on Thatcher wheat reduced the yield of seed, number of kernels
per head, number of fertile tillers, and yield of straw, but increased the protein
content of the seed, leaves, and straw.
Rhizomatous grass weeds and Ophiobolus graminis Sacc., A. G. WALKER
(Ann. Appl. Biol., 32 (1945), No. 2, pp. 177-178).-The author gives an account
of the infection of grass weeds by the take-all fungus in a wheat crop affected by
the disease; he found the fungus to be carried by the rhizomatous grasses Agropyron
repens and Agrostis spp., as well as by Holcus lanatus. Examination demonstrated
the importance of Agrostis spp. in carrying over the mycelium in the field.
Sclerotinia minor on lettuce and beans, D. SERENI (Palestine Jozir. Bot., 4
(1944), No. 2, R Ser., pp. 77-95, illus. 6).--A general study of S. minor isolated
from soft rot of lettuce and blight of beans in a number of Palestine localities,
including culture relationships and successful inoculations of lettuce, beans, and
potatoes, as well as fruits of oranges, apples, pears, bananas, and others.
The longevity of the pathogen causing the wilt of the common bean, W. H.
BURKHOLDER. (Cornell Univ.). (Phytopathology, 35 (1945), No. 9, pp. 743-744).White
Marrow bean seed infected with Corynebacteriu flaccumfaciens yielded
viable and virulent bacteria after storage at room temperature in a glass container
up to 24 yr.
The infected root-hair count for estimating the activity of Plasmodiophora
brassicae Woron. in the soil, G. SAMUEL and S. D. GARRETT (Ann. Appl. Biol.,
32 (1945), No. 2, pp. 96-101, illus. 7).-This method of estimating the relative
numbers of P. brassicae spores germinating in different soils involves the counting
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 94, January-June, 1946, book, 1947; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5062/m1/85/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.