Experiment Station Record, Volume 92, January-June, 1945 Page: 65
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19451 DISEASES OF PLANTS 65
weak symptoms appeared in stocks of S. acuta carpinifolia. The reverse transmission-from
diseased Sida to healthy Abutilon--was observed in only a few
cases. It is concluded that the agents of infectious chlorosis in the different species
of the Malvaceae are identical, but that the virus in some cases becomes attenuated
by passing through the contact zone between stock and scion of heteroplastic grafts.
Possible causes of the differences in virulence are discussed. There are 21' references.
Estudos sobre adesivos da calda bordaleza [Studies on adhesives in bordeaux
mixture], M. KRAMER and A. C. DE ANDRADE (Bioldgico, 9 (1943), No. 9, pp.
317-330, illus. 2; Eng. abs., pp. 329-330).-Preliminary experiments are described
in which 12 different adhesives incorporated in bordeaux spray were tested on
potato plants in the State of Sao Paulo, Brazil, results being interpreted in terms
of fungicidal value, visibility of the fungicide on the foliage, adhesiveness, foliage
injury, and cost. Since there was no spontaneous infection with either early or
late blight, fungicidal value could be established only in terms of increased potato
yields; significant differences are reported as compared with unsprayed controls.
The most important criterion of adhesiveness is believed to be the proportion of
copper remaining on the foliage; cassava flour, fish oil, and starch gave a Cu residue
significantly greater than controls sprayed with bordeaux alone. No significant
differences were found for powdered soap, kaolin, and casein 120; glue, resin soap,
casein 60, milk, and molasses proved inferior to plain bordeaux. A significant
statistical interaction was obtained between treatments and rainfall because of the
fact that some of the adhesives proving superior under low were not as good under
heavy precipitation; in the latter case fish oil was superior to all other treatments.
Foliage injury was more pronounced on the Eigenheimer than on the Konsuragis
variety; greatest injury followed use of resin soap, casein, and milk.
Effect of penicillin on a plant pathogen, J. G. BROWN and A. M. BOYLE.
(Univ. Ariz.). (Phytopathology, 34 (1944), No. 8, pp. 760-761, illus. 1).-In
petri dish tests, penicillin suppressed the gram-positive Erwinia carnegieana-cause
of extensive destruction of giant cactus (E. S. R., 87, p. 243)-as it did Staphylococcus
aureus-the test organism used in experiments with the penicillin drug.
There were also indications that the gram-positive Corynebacterium sepedonicwm
is also susceptible to its action.
Some factors influencing the toxicity of ozone to fungi in cold storage, R. D.
WATSON. (Cornell Univ.). (Refrig. Engine , 46 (1943), No. 2, pp. 103-106, illus.
1).-On the basis of experimental data presented, it is concluded that "in general
the relationship of concentration X the time of application = constant [K] probably
holds over a small range of concentration, but this relationship did not hold over
the range of concentrations and length of times used in the experiments reported.
In these experiments the minimum K value was obtained when a concentration of
14 p. p. m. was used and was increased both at higher and at lower concentrations
of ozone. The K value has little direct -comparative application between investigators'
results, since it reflects the method of application of ozone, the test medium
used, and probably other variable factors. The apparent toxicity of ozone to fungi
decreased as the depth of the media and the amount of organic materials in the
media increased. The unbroken epidermis of apples did not reduce the killing
power of ozone. Temperature variations from 3 to 34 C. had very little influence
on the toxicity of ozone to S[clerotinia] fructicola spores."
Stem rust of wheat and its control by breeding resistant varieties, W. P. CASS
SMITH and A. J. MILLINGTON (four. Dept. Agr. West. Austral., 2. ser., 21 (1944),
No. 1, pp. 1-16, illus. 6).-Reference is made to the latest epidemic in Western
Australia and the serious but infrequent incidence of the disease in the past. The
rust problem of the first settlers and the production of rust-escaping varieties by
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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/m1/78/: accessed February 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.