Experiment Station Record, Volume 92, January-June, 1945 Page: 72
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72 EXPERIMENT STATION RECORD [Vo. 92
Lime in the post-arsenical sprays as a means of reducing arsenical injury to
peaches, R . H. DAINES. (N. J. Expt. Stas.). (Phytopathology, 34 (1944), No.
6, pp. 763-764).-The three tests reported show that inclusion of hydrated lime in
a spray which follows one containing lead arsenate by approximately 2 weeks may
materially reduce the amount of foliage injury to peaches resulting from the use
of lead arsenate.
The first test of Fermate, a new fungicide, on cranberries, R. B. WILcox.
(U. S. D. A.). (Amer. Cranberry Growers' Assoc., Proc. Ann. Mtg., 74 (1944),
pp. 18-23).-In the 1943 field test reported, the bordeaux plats had about 35 percent
less field rot than the untreated controls; the Fermate plats, 94 percent less. Furthermore,
there were apparently no ill effects of the latter on the plants, which were in
better condition at the end of the season than those receiving bordeaux, and the
fruit was definitely larger and without spray residue at harvest.
Avocado tree decline, A. S. DEBARD (Calavo News, 17 (1943), No. 2, pp. 3,
7; also Calif. Avocado Soc. Yearbook, 1943, pp. 39-40).-The author believes avocado
tree decline to result largely from improper soil management and briefly outlines
what he considers a proper procedure of handling the trees.
Wilt of cacao fruits (Theobroma cacao).-III, Changes in mineral content
during development, E. C. HUMPHRIES (Ann. Bot. [London], n. ser., 8 (1944),
No. 29, pp. 57-70, illus. 5).-The results of this phase of the study (E. S. R., 89,
p. 460) indicated a large increase in P content of the pulp during preripening and
ripening of the fruit, and there appears to be an actual loss of P from the wall
during the latter stage. The relative (logarithmic) rates of uptake of N, P, K, and
Ca by the wall were constant and equal during the period from 25 to 57 days; this
rate was also equal to that for the dry matter increase over the same period. After
57 days the rates became less but were maintained up to 107 days. In this second
stage the relative rates of uptake of the individual elements were no longer equal to
one another, K alone maintaining a rate equal to that of the dry matter increase.
Mg appeared to behave somewhat differently from the other elements. The relative
rates of uptake of N, P, K, and Ca in the pulp were equal to one another and to
the relative rates of uptake in the wall during the first stage, but these rates were
maintained in the pulp up to 107 days. In the form of their oxides, K, Ca, Mg,
and P constituted over 90 percent of the total ash of the kernel of a ripe cacao
bean. By assuming that Ca does not move in the phloem and that the relative
proportions of the mineral elements in the transpiration stream are constant, it is
concluded that during the first 75 days of fruit development mineral substances
are imported mainly via the xylem. Hence during this period the young fruit
would tend to be sensitive to water strain or competition in such substances, either
condition being likely to cause wilting. Previous evidence had indicated a period
of 75 days as a critical stage in the development of the fruit. It is suggested that
the long critical' period of the cacao fruit is due to the late development of the
Progress report on "decline" of citrus, L. J. KLOTZ and H. S. FAWCETT.
(Calif. Citrus Expt. Sta.). (Calif. Citrog., 29 (1944), No. 10, pp. 294-295).
Web blight of seedling tung trees tentatively identified as the Rhizoctonia
stage of Corticium microsclerotia, J. R. LARGE. (U. S. D. A.). (Phytopathology,
34 (1944), No. 7, pp. 648-649, illus. 1).-Leaves of tung trees with web
blight symptoms are reported from Mississippi and Louisiana. The size of the
sclerotia formed, growth of the fungus in water-agar cultures, and the general
similarity of the symptoms on diseased tung trees to those described for web
blight of beans suggested that it is the Rhizoctonia stage of C. microsclerotia.
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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/m1/85/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.