Report on the Agricultural Experiment Stations, 1952 Page: 62
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62 REPORT ON EXPERIMENT STATIONS, 1952
a band over the row 3 days after planting. Although the infestation
was relatively light, the yields of all the treated plots except one were
significantly greater than the yield of the untreated check plot, 60.1
bushels per acre. The aldrin plots produced he highest average yield,
76.5 bushels per acre, or an increase of 16.4 bushels of corn per acre.
The Texas station found that southern corn rootworm damage
occurs more often in corn following winter legumes than on land that
has been fallowed during the winter. The damage to seedling corn
results from the larvae eating into the seedling, often destroying the
center shoot and killing the plant. In some years stands of corn have
been completely lost because of this pest. Through an application of
chlordane or BHC the Texas station obtained yields of 77.4 and 73.2
bushels of shelled corn per acre, respectively, as compared with 52.2
bushels from untreated corn. In other experiments effective control
of the southern corn rootworm was obtained with six insecticides
applied as dusts to the furrow immediately before planting.
Alfalfa Weevil Control With Dieldrin
Many farmers and ranchers, forced out of alfalfa growing because
of the spread of the alfalfa weevil may now raise this crop as the
result of weevil research carried on by the Montana station. The
weevil was first introduced from Europe about 50 years ago. It spread
rapidly, first through the Salt Lake Valley then to other Western
States, and later to some Eastern Seaboard States. Weevil-damaged
alfalfa hay is unpalatable, has markedly less carotene, and under customary
handling is far less leafy than normally grown alfalfa. To
offset this damage, which causes heavy losses each year, the Montana
station undertook studies of the weevil's life cycle and habits. The
research showed that the most likely point in the weevil's life cycle
at which practical control might be obtained at reasonable cost is
when adult weevils come out of hibernation and before they lay their
eggs. Dieldrin applied at this time at the rate of 4 ounces per acre
proved so successful in gaining control of the weevil that this treatment
has been generally accepted. It is now used throughout the entire
weevil-infested area. The cost of treatment was slightly more than
$1 an acre. Recent trials where weevils are numerous have shown
that on the first cutting alone a 0.2- to 0.7-ton increase in alfalfa per
acre may be expected from this treatment.
Horn Fly Control Profitable
Horn flies attacking cattle can be economically controlled under
South Dakota conditions by a properly located cable-type self-applicator
developed by the State experiment station. An 18-foot section
of burlap-covered cable was loosely suspended between two solidly
placed wooden fence posts about 16 feet apart. The burlap was
soaked with a 5-percent oil solution of insecticide poured from a
pitcher. The insecticide was rubbed off the burlap onto the backs of
the cattle as they walked under the cable. DDT was the most effective
material used. Fresh insecticide was added every two to three weeks.
No significant skin irritation was seen on the animals using this
applicator. This method was at least as effective in horn fly control
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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/m1/64/: accessed March 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.