-42- 
See Autographa brassloae *— N. J. Agr. Expt. Sta. (275) ■ 
One application of Gesarol A-3 dust to cantaloup at the rate of 20 
pounds per acre reduced the onion thrip 96«3 percent. On onions the re- 
duction ranged from 65 to 87 peroent.— Ewart (145 ). 
Thrips on onions were controlled by eight applications of 5 percent 
DDT in light summer spray oil— average about jf gallon per aore— made 
by hand atomiser from June 6 to August 1.— Gray (188 ) . 
At Twin Falls, Idaho, a 5-percent DDT dust, applied with a power 
duster to table onions at the rate of 25 pounds per acre gave 69 percent 
control of the onion thrips. In another experiment in which the material 
was applied with a hand duster the control was 63 percent. The DDT dust 
yielded greater control than a spray containing 4 pounds of 10-percent 
DDT per 100 gallons of water and applied with a traction sprayer under 
350 pounds pressure at approximately 100 gallons per acre. This dust 
also gave greater control than a spray containing 1 quart of nicotine 
sulfate and 3 quarts of corn sirup per 100 gallons. On the other handj 
in California a 10-percent DDT dust gave no better control than a spray 
containing 1 quart of nicotine sulfate, 4 pounds of sugar, and 8 ounces 
of a spreading agent per 100 gallons, and this niootine spray was less 
eff eotive than a DDT spray containing 6 pints of a 10-peroent DOT emul- 
sion per 100 gallons • In small-plot experiments at Beltsville, lid., the 
performance of DDT nas conformed in general with the results of the field 
experiments in Idaho and California.— White (373) • 
Experiments testing DDT and other inseoticides as sprays and dusts 
were conducted in the Salinas Valley, Calif» During 1944 in a compari- 
son of spray treatments, a DDT emulsion was apparently superior to tartar 
emetic and sugar, nicotine sulfate and sugar, nicotine alkaloid, a di- 
nitro-ni co tine-kerosene mixture, and 3-percent DDT dust. Two applica- 
tions of a DDT emulsion (l pound of DOT to 100 gallons of water), at the 
rate of 190 gallons per acre, gave a 98.7 percent reduotion in nymphs 
on July 27, one week after the first application; a 61.8 percent reduo- 
tion 24 days after this spray treatment; and an 85.1 percent reduction 
22 days after the second application (made on August 23) • An analysis 
of onions from plots sprayed twice with the DDT spray mixture indicated 
that DDT was present on the tops and bulbs. When the onions (bulbs) 
were peeled, no DDT was found. Yield records obtained on October 23 
from two plot3 sprayed twice with DDT emulsion gave increased yields of 
onions when compared with untreated check plots.— Lange and Thwaits ( 243 ) . 
Spray and dust applicfltions with several insecticides were made to 
control the onion thrips in the San Joaquin Delta, Calif. DDT, applied 
as a spray or dust, was apparently more effective in reducing and pre- 
venting the inorease of the onion thrips population than was a rotenone 
or dinitro spray. A 3 -percent DDT dust at the rate of about 50 pounds 
