Report on the Agricultural Experiment Stations, 1952 Page: 61
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RESEARCH ON USEFUL AND DESTRUCTIVE INSECTS 61
in southern California in which the quick-decline disease has spread
rapidly, and generally low populations in areas in which the disease
has spread slowly,
None of the other 311 species of insects tested has transmitted the
disease, with the possible .exception of certain treehoppers, about
which the evidence is inconclusive. The California station also determined
that the germinate leafhopper is a carrier of the virus of
yellow leaf roll of peaches. These discoveries answer two of the most
puzzling questions growers and research people heretofore have faced,
namely, how are the quick-decline and the yellow leaf roll viruses
Rootworms Controlled in Peanuts
The Virginia station (coop. USDA) has found aldrin and toxaphene
effective against the southern corn rootworm attacking peanuts.
However, the two insecticides proved effective only in the darker and
heavier peanut soils, and gave "no significant monetary return" in
light sandy soils. In the heavy soils, more peanuts were produced
where the insecticides were used and the grade of the entire crop was
improved as compared with peanuts on the test plots on which no insecticides
were used. This means that the insecticides will be beneficial
on 25 to 30 percent of Virginia's peanut land-at least 30,000
acres. Yields can be expected to increase from 200 to 700 pounds per
acre, and the grade may be raised to yield from 1 to 3 cents more a
Either insecticide may be applied with fertilizer-spreading equipment
or with dusters. The estimated cost of either insecticide was
less than $10 an acre. Treated land yielded from $5 an acre more in
the case of light sandy soil, to $106 per acre more in the heaviest soil.
Use of the insecticides is expected to boost Virginia income from peanuts
by $1,500,000 a year.
Corn Rootworm Control Increased Yield
An infestation of southern corn rootworm that had damaged about
two-thirds of the young corn in a 4-acre field was studied in an experiment
by the Kentucky station. The corn was replanted over the
original rows and treated with BHC (benzene hexachloride) at the
rate of 2 pounds of gamma isomer per acre, toxaphene at 3 pounds
per acre, and chlordane, aldrin, and dieldrin at 5 pounds per acre,
applied as 13 gallons of spray mixture to the soil surface. When the
corn was cut for silage the plots treated with BHC gave the highest
yield, 21,697 pounds of silage per acre; yields produced by the other
insecticides ranged from 19,780 to 19,015 pounds per acre. The
untreated check plots averaged 14,915 pounds per acre. A comparison
of these figures shows that the aldrin, chlordane, dieldrin, and toxaphene
treatments resulted in increased yields of silage exceeding 2
tons and BHC in an increase exceeding 3 tons per acre.
In another field in Kentucky the same treatments were applied by
the Kentucky station, except that the chlordane, aldrin, and dieldrin
were applied at the rate of 4 instead of 5 pounds per acre. The spray
mixtures were applied with a tractor-mounted, weed-type spray boom
at 30 pounds pressure, 6 gallons of spray per acre being applied in
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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/m1/63/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.