Experiment Station Record, Volume 76, January-June, 1937 Page: 76
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76 EXPERIMENT STATION RECORD [Vol. 76
both being subjected to air currents produced by an electric fan operating 8 hr.
a day beginning with the fifth day, proved most satisfactory. Less air movement
resulted in molding and decomposition of food, while a greater circulation
caused the food to become dry, hard, and unsuitable for the growing
larvae."
Liquid applications to control peach borer and lesser peach borer, S. C.
CHANDLER (Jour. Econ. Ent., 29 (1936), No. 4, pp. 754-756).-The results of
three seasons' tests in southern Illinois with liquid applications, including
paradichlorobenzene dissolved in miscible oils, and dichloropentane for control
of the peach borer and the lesser peach borer are summarized in tables.
The practical value of liquid treatments for the peach borer was not demonstrated,
the cost being much greater than that of crystalline applications. With
the lesser peach borer only a poor control was obtained, paradichlorobenzene
dissolved in 1 gal. of Dendrol and diluted with water to contain 2 oz. of paradichlorobenzene
per pint being the most promising (82 percent kill).
The American species of Psychoda (Diptera: Psychodidae), F. DEL
ROSARIO (Philippine Jour. Sci., 59 (1936), No. 1, pp. 85-148, pls. 6, fig. 1).-This
synopsis of the genus Psychoda, in which the author recognizes and describes
39 forms (5 being new), includes a synoptic table for the American species of
the genus.
Occurrence and sequence of mosquitoes in southeastern Arkansas in
1935, W. R. HORSFALL (Jour. Econ. Ent., 29 (1936), No. 4, pp. 676-679).--The
data here presented indicate the sequence and distribution of the more common
species of mosquitoes (23 in number) in the coastal plain of Arkansas.
Mineral oils as mosquito larvicides, D. R. P. MURRAY (Bul. Ent. Res., 27
(1936), No. 2, pp. 289-305).-In the work reported, "it is shown to be desirable
to have an oil which readily penetrates the tracheae of larvae. Actual toxicity
is a secondary matter, for the presence of oil prevents ordinary development.
The best penetrating oils are shown to be of a medium boiling range (with suitable
modification for temperature), not involatile enough to be markedly
viscous, and not volatile enough to give that immediately irritating effect which
causes the larva to collapse its tracheae and dive without receiving a dose of
the oil. Other conditions which prevent or hinder normal oiling of the tracheae
have also been discussed, together with their bearing on the at present accepted
views as to what are desirable features for a larvicidal oil."
Hordeum grasses as hosts of the hessian fly, E. T. JONES (Jour. Econ.
Ent., 29 (1936), No. 4, pp. 704-710, figs. 2).-It has been found that due to susceptibility
to infestation, wide distribution, and life habits similar to winter
wheat, H. psillum is an important potential host capable of maintaining populations
of the hessian fly in the absence of wheat. "H. pusillunI is slightly less
attractive than wheat for oviposition by the hessian flies reared from wheat,
but is more attractive than H. jubatun, Aegilops cylindrica, Elymus irginicus,
Bromus secalinus, B. tectorum, and Oregon or Italian ryegrass. It is probable
that host selection is an influencing factor. Puparia produced on H. pusillum
grown under semiarid conditions are smaller than puparia from wheat. However,
plants grown in moist soil produce normal puparia. Pot tests involving a
total of 15 strains of H. pusillum, H. jubatum, H. nodosum, H. murinrn, H.
maritimum, H. gussoneanurn, and H. spontaneum reveal these wild grasses to be
fly hosts but varying somewhat in their susceptibility."
Pupal period of the hessian fly, H. H. WALKDEN (Jour. Econ. Ent., 29
(1936), No. 4, pp. 701-704).-In observations made of 328 hessian fly pupae in
Kansas in 1923, 1924, 1927, and 1928 the pupal period ranged from 6 to 33 days.
The pupal period for fall-emerging flies was much less than for spring-emerging
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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 76, January-June, 1937, book, 1938; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5080/m1/94/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.