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Keep the Premises Clean, --The 
farmer should constantly be on the 
lookout for places where house flies 
and stable flies breed, and eliminate 
them. He should haul manure from the 
barnyard and spread it on the fields at 
least twice each week, and frequently 
dispose of accumulations of straw, gar 
bage, and vegetable refuse. The use 
of insecticides should be considered 
only as-a supplement to sanitation. 
Use Insecticides Outside Dairy 
Barns.--Apply residual sprays to sur- 
faces where fliesrestor roost. Treat 
not just the dairybarn, but beef-cattle 
barns, stables, sheds, pigpens, and 
poultry houses, as well as corral 
fences, trees, garbage cans, and any 
other places where the flies commonly 
rest. DDT may be used outside the 
dairy barn as long as it continues to 
give satisfactory control. When it 
fails, however, use lindane, chlordane, 
methoxychlor, or toxaphene. Apply 
as often as necessary. Satisfactory 
control is usually obtained for 2 to 4 
weeks or longer from one application. 
Flies that have developed a strong re- 
sistance to DDT may also be difficult 
to control with methoxychlor. 
The residual sprays should be ap- 
plied so that the surfaces are wet to 
the point of runoff. The amount of 
spray required will vary depending on 
the nature of the surface, whether 
rough or smooth, and also to some 
extent with the type of formulation. On 
the average, 1 gallonofspray willtreat 
900 square feetof surface. On smooth 
