Experiment Station Record, Volume 92, January-June, 1945 Page: 74
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74 EXPERIMENT STATION RECORD [Vol. 92
Whatever method of measurement is used, divergence from randomness tends to
decrease somewhat as a plat is subdivided into smaller and more numerous quadrats,
but the decrease in the d factor is not uniform or progressive and is not sufficiently
large to reduce the value of the factor as a measure of the overdispersion. The
relative variance also provides one of the convenient and practicable measures of
divergence from randomness; it has the disadvantage in some cases of increasing
with the size of the plat and of the mean. When the probit-logarithmic transformation
is used, the Ribes data here presented take a straight-line form, providing
another manner in which the field records can be subjected to analysis of variance.
The coefficients in this transformation do not, however, provide a convenient
measure of divergence from the random distribution. This transformation is' not
so well adapted to areas where the distribution is very close to the strictly random
type. There are 23 references.
Studies on Polystictus circinatus and its relation to butt-rot of spruce, R.
GOSSELIN (Farlowia, 1 (1944), No. 4, pp. 525-568, illus. 13).-This disease was
studied on account of its importance in the Province of Quebec, as well as because
of its peculiar behavior. White pocket butt rot was localized in such a definite way
as to suggest relationships with conditions of temperature, insect epidemics, mechanical
damage, or with the chemical nature of the soil; none of these factors,
however, appeared responsible for the disease. On the other hand, field observations
gave evidence that the causal agent penetrated into its host by mycorhizal association.
Results of further study led the author to believe that the fungus has actually formed
a mycorhizal association of the usual type. If P. circinatus penetrates into its host
through a symbiotic association-and there is presumptive evidence that such is the
case-this fact will open an entire new field in forest pathology, associating the
two opposing concepts of symbiotism and parasitism. If these findings prove generally
true, foresters will no longer be able to consider the butt rots merely as a
reducing factor for the volume of the tree, but must determine under what conditions
the damage from parasitism exceeds the beneficial effects of symbiotism in trees.
Is natural gas injurious to flowering plants? F. G. GUSTAFSON (Plant Physiol.,
19 (1944), No. 3, pp. 551-558, ills. 2).-On the basis of experimental data presented,
it is concluded that natural gas in air is not injurious to yellow green coleus,
sunflower, snapdragon, stock, or tulip plants at a concentration of 1 percent; higher
concentrations were not used. Tomato, cyclamen, marigold, sensitive plants, carnations,
and Kalanchoe tubiflora were not injured by 2 percent; again, higher concentrations
were not used. Bougainvillea and swainsonia were injured by 2 but not
by 1 percent. Seeds of lupine, radish, wheat, squash, and sunflower germinated as
well in 1.5-5 percent natural gas as in air.
Dipping rooted chrysanthemum cuttings in Fermate for Septoria leafspot
control, A. W. DIMOCK and H. ALLYN. (Cornell Univ. et al.). (Chrysanthemum
Soc. Amer. Bul., 12 (1944), No. 2, pp. 9-11).-Good results are Teported
from trials of this method during the past season.
Fermate treated cuttings reduces basal rot and stimulates rooting, C. M.
TOMPKINS. (Univ. Calif.). (Chrysanthemum Soc. Amer. Bul., 12 (1944), No. 2,
pp. 3-4).-In the tests reported Fermate proved excellent as a protective dust
against a basal rot of soft green cuttings of the pompon and large-flowering varieties
of the florists' chrysanthemum.
Studies on lily virus diseases: The mottle group, P. BRIERLEY and F. F. SMITH.
(U. S. D. A.). (Phytopathology, 34 (1944), No. 8, pp. 718-746, illus. 11).Three
mottle viruses from lilies, a latent type from Lilium tigrinum (LT), the
strong mottle of Easter lily (CM), and a more virulent mutant from the latter
(VCM), were compared with McWhorter's tulip viruses 1' and 2 in the test species
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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/m1/87/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.