Experiment Station Record, Volume 94, January-June, 1946 Page: 78
xi, 975 p. ; 24 cm.View a full description of this book.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
78 EXPERIMENT STATION RECORD Vol. 94
P. fluorescels, P. marginalis, P. phaseolicola, P. tumefaciens, P. pisi, P. cera-si, and
certain strains of P. syringae did not. Some evidence is given that the deleterious
activity of P. mors-prunorunt may be due in part to an endotoxin of protein nature
obtained from the dried bacterial cells by acetic acid extraction.
Fruit gumming of Victoria plums.-Progress report V, W. B. ADAM and
D. DICKINSON (Univ. Bristol, Fruit and Veg. Preserv. Res. Sta., Campden, Ann.
Rpt., 1944, pp. 12-19, illus. 1).-Reporting further studies (E. S. R., 90, p. 355),
the authors found that the frequency of gumming increased directly with the rainfall
during the later stages of ripening.
On the spread of crinkle in Royal Sovereign strawberries in south-west
England, A. BEAUMONT and L. N. STANILAND (Ann. Appl. Biol., 32 (1945), No. 2,
pp. 123-127, illus. 4).-Observations of marked plants at periodic intervals indicated
that the maximum appearance of symptoms occurs in June-July. The findings suggest
that summer infection spread by apterous aphids passing on to neighboring
plants is probably the principal mode of transfer of this virus disease.
Blueberry stunt disease, S. JOHNSTON, D. CATION, and C. A. BoYEit (lichiganl
Sta. Quart. Bul., 27 (1945), No. 4, pp. 409-412).--This virus disease of the blueberry
is said to be a potentially serious menace to cultivated blueberries. Fortunately,
field surveys have shown that it is not well established in Michigan and thus far
has not spread rapidly. It is suggested that growers should plan an annual inspection
of their fields by personnel of the State Department of Agriculture as an insurance
against its further spread.
Further tests of organic fungicides for control of cranberry fruit rot, R. B.
WILCOX. (U. S. D. A.). (Amer. Cranberry Growers' Assoc., Proc. Ann. Altg.,
75 (1945), pp. 16-22).-Fermate again (E. S. R., 92, p. 72) proved much superior
to bordeaux; presumably about three times as much in the form of dust would be
required to give the same control as in the form of spray. Dithane A-10 proved about
as effective as Fermate; Dithane B-11 controlled field and early storage rots satisfactorily,
but was less effective than Fermate for end-rot control. U. S. Rubber
No. 604 was more effective than Fermate against rot, but retarded the coloring of
the fruit. With all fungicides tested, end rot was less amenable to control than
were the rots appearing in the field or shortly after harvest. The 3-100 concentration
of Fermate would appear to be required only where experience has shown rot
to be very severe and hard to control or where it is expected that the berries will
be stored for sometime before put on the fresh-fruit market. For berries to be
processed or marketed promptly the 2-100 formula appears to be ample, even for
severe rot; where little rot usually occurs and bordeaux has given satisfactory control,
1-100 Fermate should be sufficient. Synthetic organic fungicides other than
Fermate cannot be recommended for commercial use until they have undergone
further testing.
The cup fungus, Ciboria carunculoides, pathogenic on mulberry fruits, H. H.
WHETZEL and F. A. WOLF. (Cornell Univ. et al.). (Mycologia, 37 (1945), No. 4,
pp. 476-491, illus. 4).-As a result of this study, the organism is'transferred from
Sclerotinia, to Ciboria as C. carunculoides n. comb. It possesses both sclerotial and
apothecial phases but lacks conidia. Its ascospores-which are forcibly expelledlodge
on the stigmas and initiate infection at time of flowering; as a result each
drupelet may become transformed into a separate sclerotium. The sclerotia are
composed of both fungus and host tissues and somewhat resemble grains of popcorn.
Apothecia for the succeeding year are initiated in spring, about a month
after ascospore discharge; they originate from elements of a mantle that occurs
immediately beneath the outer tissues normally destined to become the fleshy portion
of the mulberry fruit. This mantle completely invests the young sclerotium and
consists of spermatiophores with interspersed archicarps; the spermatia are produced
in such abundance as to be extruded in a column at the tip of each sclerotium.
Upcoming Pages
Here’s what’s next.
Search Inside
This book can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Book.
U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 94, January-June, 1946, book, 1947; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5062/m1/89/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.