Experiment Station Record, Volume 74, January-June, 1936 Page: 57
xx, 1029 p. ; 24 cm.View a full description of this book.
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19361 DISEASES OF PLANTS 57
fruits. Losses as high as from 50 to 90 percent of the tomatoes in some
cars have been reported. Decay develops slowly in green tomatoes, but
rapidly in turning and ripe fruits. Inoculated tomatoes show little decay below
45 F. or above 80. The most rapid decay develops at from 65 to 70. On
potato-dextrose agar (pH 4.7 and 6.01) the minimum for growth of the organism
was 35, the optimum 70, and the maximum 90. The growth rate was
always more rapid on the medium with a pH value (6.01) corresponding
to that of the juice of ripe tomatoes than on the one corresponding to that
of the juice of mature-green tomatoes (pH 4.7). This harmonizes with the
fact that in market tomatoes the most rapid decay occurs in the turning and
ripe stages.
Morphologic studies of Septoria lycopersici, H. A. HARRIS (Phytopathology,
25 (1935), No. 8, pp. 790-799, figs. 3).-The following morphological and developmental
features of a strain of S. lycopersici isolated from garden-grown
tomatoes were elucidated by this study, conducted at the University of Illinois.
The mycelium consists of hyaline, thin-walled and of brown, thick-walled types.
Pycnidial formation is symphyogenous. The pycnidial cavity forms by schizogenous
and lysigenous processes. Ostiole formation occurs by tensional strain
of the pycnidial wall on the leaf epidermis and by pressure of the pycnospores
on the pycnidial wall. Pycnospore formation occurs by basipetal elongation of
the sporogenous cells without intervening conidiophores, the spore becoming
separated from the sporogenous cell by a basal constriction. Pycnospores germinate
by lateral germ tubes from the inner cells and by apical-cell elongation.
Infection penetration is stomatal. The mycelium is intercellular and effects cell
penetration by haustoria.-(Courtesy Bioll. Abs.)
Summary of orchard diseases in Massachusetts in 1933, 0. C. BOYD
(Mass. Fruit Growers' Assoc. Rpt., 40 (1934), pp. 74, 76, 77).-This note from
the Massachusetts State College briefly summarizes seasonal disease conditions
for apples, pears, and stone fruits.
The fungus flora of apple twigs and branches and its relation to apple
fruit spots.-I, Review of literature and preliminary experiments,
L. OGILVIE (Jour. Pomol. and Hort. Sci., 13 (1935), No. 2, pp. 140--148).-The
object of this paper was to call attention to the established cases of connection
between twig or branch and fruit infections and to record briefly some observations
and experiments bearing on them. The following fungi, parasitic on both
living branches and fruit, are discussed: Venturia inaequalis, Glomerella cingulata,
Phacidiella discolor, Fusarium lateritium fructigenum, Physalospora cydoniae,
Neofabraea malieorticis, Gloeosporium perennans, and Phyllosticta solitaria.
The following, saprophytic on dead twigs and branches, are also reported as
infecting apple fruits: G. album, Alternaria spp., Botrytis cinerea, and Diaporthve
perniciosa. Other sources of fruit infection and orchard control measures in
general are also discussed.
Decane ring-spot of apple leaves, and symptoms of decane injury in
apple, potato, and onion, P. A. YOUNG (Amer. Jour. Bot., 22 (1935), No. 7, pp.
629-634, pl. 1).--This contribution from the Montana Experiment Station
describes injury to apple leaves and twigs and to potato leaves from applying
synthetic n-decane in drops to the underside of the foliage. This material is
one of the toxic constituents of petroleum oils.
"Apple rust, up to date ", E. F. GUBA (Mass. Fruit Growers' Assoc. Rpt.,
40 (1934), pp. 48-52).-In this contribution from the Massachusetts State
College, the author summarizes present knowledge, including his own observations
during the preceding 8 yr., relative to the distribution, injuriousness, and
control of apple rust, with special reference to Massachusetts conditions.
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General Index to Experiment Station Record, Volumes 71 to 80, 1934-1939 (Book)
A topical, alphabetically arranged index to volumes 71-80 including experiment station records, publications reviewed, and foreign publications. In has a list of all editorial notes from the referenced volumes.
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United States. Office of Experiment Stations. Experiment Station Record, Volume 74, January-June, 1936, book, 1937; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5082/m1/77/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.