Experiment Station Record, Volume 92, January-June, 1945 Page: 70
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70 EXPERIMENT STATION RECORD [Vol. 92
certain temperatures and as less pathogenic than the original culture on beans, soybeans,
cowpeas, and English peas.
Little disease found in California cabbage seed, W. C. SNYDER and K. F.
BAKER. (Univ. Calif.). (Seed World, 55 (1944), No. 9, pp. 41-42).-A brief
note on a survey of the seed crop in 1943.
Shanking: A new disease of onion and shallot, C. J. HICKMAN (Gard. Chron.,
3. ser., 114 (1943), No. 2964, pp. 140, 141, illus. 1).-A preliminary report on a
disease of onion and shallot resembling the shanking disease of tulip due to Phytophthora.
The mycelium of a species of Phytophthora was observed in the rotted
tissues of every affected specimen thus far examined.
Bacterial soft rot of spinach, M. A. SMITH. (U. S. D. A. et al.). (Phytopathology,
34 (1944), No. 8, pp. 747-752, illus. 1).-Morphological studies as well
as cultural and biochemical tests indicated the isolates from harvested spinach
soft rot and Erwinia carotovora to be closely related if not identical. Differences
in carbon metabolism are not considered sufficient to differentiate them. Pathogenicity
tests' showed that infection of spinach may take place through injured or
uninjured leaves. Isolates from rotted spinach proved pathogenic to potato tubers.
Spinach soft rot may be controlled in transportation and marketing if a temperature
of 4.5 C. is maintained for 8 days.
Tomato diseases, G. H. BERKELEY and J. K. RICHARDSON (Canada Dept. Agr.
Pub. 759 (1944), pp. 18, illus. 22).-An informatory contribution on fungus, bacterial,
virus, nematode, and physiological diseases and their control.
Basal rot of tomato, J. K. RICHARDSON and G. H. BERKELEY (Phytopathology,
34 (1944), No. 7, pp. 615-621, ills. 2).-This hitherto unreported basal rot of
greenhouse tomato-proved to be caused by an unidentified fungus-was found
near London, Ont. The symptoms, consisting of defoliation of the lower leaves
and a cortical rot of stalk and roots, and a description of the pathogen are given in
detail. The disease, which may reduce yields as much as 50 percent, can be controlled
by soil sterilization with steam, chloropicrin, or formalin.
The liberation of virus, together with materials that inhibit its precipitation
with antiserum, from the solid leaf residues of tomato plants suffering from
bushy stunt, F. C. BAWDEN and N. W. PIRIE (Brit. Jour. Expt. Pathol., 25
(1944), No. 2, pp. 68-80).-After the sap had been expressed from minced tomato
leaves infected with tomato bushy stunt virus, the solid residues contained approximately
as much virus as the sap. This virus was most effectively liberated by
incubating residues with a commercial trypsin preparation and then passing them
through a roller mill; some virus was liberated by either treatment alone. Incubation
with "trypsin" greatly increased the amount of virus liberated by milling,
whereas extended milling reduced the amount liberated by trypsin. Purified preparations
of virus from sap and solid residues had similar properties. Extracts of
milled fiber contained some virus combined with chromoprotein to form a nonprecipitating
antigen; such extracts did not precipitate with virus antiserum until
the chromoprotein had been removed. Nonprecipitating complexes of virus and
chromoprotein can be formed by milling fiber of uninfected plants to which purified
virus is added. Extracts of fiber from healthy and infected leaves which have been
incubated with trypsin contain material inhibiting the precipitation of bushy stunt
virus by its antiserum.
The unimportance of tomato seed in the dissemination of Verticillium wilt in
California, B. A. RUDOLPH. (Calif. Expt. Sta.). (Phytopathology, 34 (1944),
No. 7, pp. 622-630).-In experiments during five seasons over a 10-yr. period, the
receptacles of 2,792 tomatoes produced on 164 severely diseased plants were cultured
but only 180 were found to be infected by V. albotrunt. More than 26,768 seeds
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/83/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.