Report on the Agricultural Experiment Stations, 1952 Page: 63
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RESEARCH ON USEFUL AND DESTRUCTIVE INSECTS 63
as standard spraying techniques, resulted in large savings in time
and labor, and did not disturb the cattle.
More than 200 tests of self-applicators made at the Oklahoma station
indicate that cattle may be kept relatively free from horn flies for
1 cent per head per season. Success of these self-applicators was
almost completely dependent upon proper placement. In pastures
with little or no large brush preferred places were near water tanks,
mineral or "cake" feeding locations, or shade. In brushy pastures,
close observation of the animals to determine where they loafed most
was needed so that the self-applicator could be placed to the best
In spraying experiments conducted by the Oklahoma station (coop.
USDA) at Fort Supply, treated cattle were sprayed with 2 quarts
of 0.5 DDT on the last day of May, June, July, and August for horn
fly control. Check animals were not sprayed. Over a period of 7
years, these carefully controlled experiments have shown that an
increase in weight of about 18 pounds per animal per fly season was
obtained from good horn fly control. The lowest increase obtained
during the 7-year study was 12 pounds per year, whereas the highest
gain was 28 pounds per animal per year.
Insecticides Control Pickleworm
Insecticide dusts applied to squash, cantaloup, and cucumbers in
experimental plots at the Georgia station increased the yields a maximum
of 3,314, 5,940, and 6,177 pounds of worm-free fruit per acre,
respectively. The pickleworm infestation was moderate to heavy
during this test and the weather was dry so that the insecticides were
not washed off by frequent rains. The squash and cucumber plots
were dusted 6 times each and the cantaloup plots 7 times. Parathion,
lindane, and an insecticide known under the trade name of EPN
(0O-ethyl O-p-nitrophenyl benzenethiophosphonate) and DDT gave
increased yields of worm-free squash and cucumbers 2 to 3 times
greater and of cantaloups 31/2 to 5 times greater than the untreated
DDT Dust Increases Yield of Fall Field Peas
The Louisiana station has tested the effectiveness of DDT dust
in controlling the cowpea curculio and stink bugs. These insects
are largely responsible for late summer and fall failures of field peas
in Louisiana. When the pods were approximately one-fourth mature,
10 percent DDT dust was applied to the trial plots. One-half of the
plots received a second application 1 week later. Plots dusted once
produced 1,938 pounds of clean green pods per acre. Those receiving
two applications produced 2,283 pounds per acre, and the untreated
plots produced 1,560 pounds. Plots treated once showed a 24-percent
increase in yield of peas over the untreated plots; those getting two
applications of DDT gave a 46-percent yield increase.
Insect Control Reduces Cabbage Bursting
The amount of bursting of cabbage heads was reduced about 50
percent by insect control in research carried on at the New York
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United States. Office of Experiment Stations. Report on the Agricultural Experiment Stations, 1952, book, January 1953; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5990/m1/65/: accessed May 29, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.