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When tested by the method described under Rhodnius sp. the lethal 
dose of pure DDT to adult Musca domestlca was 1.0 mg. per square centi- 
meter of surface.— Buxton ( lOO ) > 
When DDT was sprayed in barns of the Idaho Agricultural Experi- 
ment Station in September, the air was full of flies* In October 
when flies should have been their worst, the barns were as fly-free as 
they usually are in midwinter. The DDT was applied as a light spray, 
of about 1 percent strength, to walls, ceilings, doors, and windows.— 
Idaho Univ. Col. Agr. (221) . 
The methoxy, ethoxy, n-propoxy, and n-butoxy analogs of DDT were 
toxic to houseflies in dimTnishing degree"~in the order named. The 
methoxy analog exoels DDT in knook-down but does not equal it in kill* 
—Prill et al. (297) . 
DDT percentages evidently are not being increased in the aerosol, 
and Army authorities continued to depend on pyrethrum as the knock-down 
ingredient in fly and mosquito repellents, with sesame oil as the 
synergist and Freon-12 gas as the carrier. Yet DDT has been shown to 
increase the effectiveness of the formula considerably.— Stenerson (336 ) » 
In kerosene solution, varatridine was more toxic than cevadine to 
houseflies, and both these constituents of sabadilla were more toxic 
than DDT.— AIF (66) . 
Two days after the initial assault in Iwo Jima in the Pacific the 
island was sprayed with a DDT solution by airplane. In spite of the 
thousands of American dead and Japanese corpses on the island, the fly 
problem which was so great in former Pacific amphibious operations was 
pj-»otically nil. — Peaker (291) . 
A report of tests of a DDT-oil fog in the Salt River Valley, Ariz. 
The oil solution of DDT is not burned but made into a fog by feeding 
into a current of steam. Some of the oattle were driven through a oan- 
vas-oovered ohute, with the generator blowing fog over them. Some were 
simply enveloped in fog as they stood in an open corral. A blast was 
also turned into the barn. Almost at onoe lifeless hornflies and house- 
flies began to roll off the backs of the oattle. Flies rained down upon 
the floor of the barn and oontinued to fall for two days. For 2 days, 
also, the "fogged* cattle remained free of flies. Dr. Dietz said that 
from his experiments the residual effeot of DDT lasts for 14 days in the 
open air when application is by spray. Apparently the time is less when 
application is by fog, probably because the amount deposited is so much 
less.— Anon. (49). 
A water suspension of DDT gave excellent oontrol of flies in a 
dairy barn. One of the mixtures tested was, DDT (AK-20, containing 20 
percent DDT) 10 pounds, blood albumin 6 ounoes, water 100 gallons.— 
Uiohelbaoher et al. (268). 
