-140- 
We can anticipate the use of DDT sprays on -walls and screens for 
gradual reductions of fly populations. If some formulations of such 
sprays are used on animals, they may be found rather slow in killing 
stable flies, horse flies, and deer flies. These kinds of flies may 
bite and fill with blood before they die from the effects of the sprays. 
For these important kinds of flies there would seem to be an oppor- 
tunity for inoluding in the new sprays a repellent that would drive 
away the flies during milking or for longer periods of time. Again, 
this involves more research if we are to get the correct answer. If 
repellents are used in spray mixtures, will they drive away the inseots 
during the period when tiie fly toxioant is most effective, thereby re- 
ducing the efficiency of a spray as a killer of horn flies and other 
flies on oattlo?~Dove (137) . 
Aocording to the U« 3, Army Medioal Department the DDT insecti- 
cides suitable for use in fly control are* (l) Insecticide, spray, 
DDT residual effect (5 percent DDT in kerosene), Quartermaster Stook 
No. 51-1-505} (2) inaeotioide, powder, louse (10 peroent DDT in pyro- 
phyllite), Quartermaster Stock No. 51-1-180 j (3) larvioide, DDT, 
powder, dusting (10 percent DDT in tale), Quartermaster Stook No. 
61-L- 122» Use idie DDT insectioides as follows in pit latrines: Apply 
the spray at the rate of 1 quart for approximately 250 square feet to 
the walls of the pit, inside and outside the latrine box, and to all 
the walls, window screens, and screen doors of the enclosure. One 
application usually is sufficient for several months. Apply DDT resi- 
dual spray at the rate of 2 ounces per latrine box hole, or 10-percent 
DDT powder at the rate of 1 ounoe per hole %o the pit contents. Apply 
twice weekly until experience reveals how often application need be 
repeated. Residual spray may also have a plaoe in the field for 
treating ration dumps and dead bodies to control fly breeding. As 
little as 0.025 peroent of DDT in oil has been found effective in kill- 
ing maggots breeding in meat. The residual spray should kill both 
adult flies and larvae. Since the odor at times may be offensive, 
work is under way to find a satisfactory deodorant to incorporate in 
spray for this purpose.— Anon. (26) • 
For the oontrol of houseflies and stableflies apply DDT exaotly 
as for residual spraying for mosquitoes. The spraying of manure piles, 
the walls behind them, and the most obvious gathering plaoes in the 
stables will destroy numerous flies before they leave the breeding 
grounds. Fer household oontrol treat especially screens, door and 
window frames, shelves, the edges of pillars, and other areas that fly 
"spooks* indioate as habitual resting places.— Freeborn (160) . 
