Experiment Station Record, Volume 92, January-June, 1945 Page: 69
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19451 DISEASES OF PLANTS 69
duced cells averaging more than 2.5t long; some produced spirals, and others did
not. Aerial mycelium was inhibited by high-N media. Most rapid growth was
made on a medium containing thiamine; here the number of sectors was greater.
On potato-dextrose agar four isolates grew somewhat better at 200-240 than at
18 C. Sectors were produced at all temperatures studied, but were smaller at 18
than at 22 and 24. Ten isolates grew on potato-dextrose agar adjusted to pH
5-8.5, but after 60 days five of them had made very little growth at pH 5; sectors
were produced at all pH values except 5. A number of isolates tested on three
commercial and five seedling potato varieties differed in pathogenicity. No definite
correlation was detected between pathogenicity and cultural or other characteristics.
Variants seemed to differ from their parent cultures in pathogenicity. Certain
strains produced russeting of normally smooth-skinned varieties.
A Thecaphora smut on potatoes, M. F. BARRUS. (Cornell Univ.). (Phytopathology,
34 (1944), No. 8, pp. 712-714, illus. 2).-The cause of the buba disease
of potatoes in Venezuela (E. S. R., 90, p. 351) is here described as T. solani n. sp.
Rice yields in root rot areas improved by application of fertilizer, S. J. P.
CHILTON, W. A. DOUGLAS, and T. C. RYKER. (Coop. U. S. D. A.). (Louisiana
Sta. Bul. 379 (1944), pp. 8, illus. 1).-In the rice district of southwestern Louisiana
there are numerous areas where rice fails to grow satisfactorily; these are usually
poorly drained and known locally as "root rot areas" or "alkali spots." In 5 years'
experiments with a 10-10-0 fertilizer applied at the rate of 400 lb. per acre on such
areas the material was made up by applying equal amounts each of 20 percent
ammonium sulfate and acid phosphate. Little increase in yields followed where the
land had not also been drained; with drainage and fertilizer, an average increase of
3.6 barrels of rice per acre was obtained.
A necrose da base da folha do sisal [Necrosis of the leaf base in sisal], J. C
MEDINA (Bragantia, 3 (1943), No. 4, pp. 73-84, illus. 4; Eng. abs., p. 81).Agave
sisalana growing in various localities of the State of Sao Paulo is often
seriously damaged by this trouble, the symptoms of which resemble the "leaf foot
disease" previously reported from Java and Africa. In a fertilizer experiment described,
the disease was controlled by application of K2S04. It is said to be the
only prevalent and destructive disease of sisal hitherto reported in this State, where
this fiber plant is usually cultivated on K-deficient soils.
Additional strains of the sugar-beet curly top virus, N. J. GIDDINGS. (U. S.
D. A.). (Jour. Agr. Res. [U. S.]. 69 (1944)., No. 4. tp. 149-157. ills. 4).---
The author differentiates 6 strains of curly top virus (Ruga verrucosans) from
each other and from the 4 previously described strains (E. S. R., 79, p. 639).
Turkish tobacco, Red Mexican bean, and a susceptible and a resistant variety of
sugar beet were employed as hosts in preparing data for a key to differentiate the
10 strains; a list is also given of the plants tested for possible value as differential
hosts. Inoculation of beans through the cotyledons proved more effective than
through the leaves. Some virus strains induced extreme dwarfing and high mortality
without the pronounced distortion hitherto thought characteristic of severe
curly top injury. Since efforts to induce changes in virulence were unsuccessful,
these virus strains are believed to be very stable. Their relative virulence is compared
for each of the four hosts used in formulating the key table.
Contestando algunas preguntas sobre el "carbon" de la cafia [Answering some
questions concerning sugarcane smut (Ustilago scitaminea)], W. E. CROss
(Estac. Expt. Agr. Tucumdn Cir. 121 (1943), pp. 4).
The occurrence of a variant in Rhizoctonia solani, L. H. PERSON. (La. Expt.
Sta.). (Phytopathology, 34 (1944), No. 8, pp. 715-717, illus. 1).-A sector variant
occurring in an isolate from snap bean is described as differing in growth rate at
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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/m1/82/: accessed April 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.