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Lindane is marketed as a 25-per- 
cent wettable powder and also as 20- 
or 25-percent emulsion concentrates. 
Lindane sprays should contain at least 
0.3 percent of the insecticide. To 
obtain this concentration, add 10 pounds 
of the wettable powder or 11/2 gallons 
of the 20-percent emulsion concentrate 
to 100 gallons of water. For 5 gallons 
use 1/2 pound of the wettable powder 
and 0.6 pint of the emulsion. When 
emulsions are used for treating smooth 
surfaces, the concentration should be 
increased to 0.5 percent. 
Insome areas toxaphene has given 
good results of fly control in barns, 
If used for this purpose the finished 
spray should contain 5 percent of toxa- 
phene. 
Use Insecticides in Dairy Barns. -- 
Methoxychlor and lindane are the only 
insecticides now recommended as re- 
sidual sprays for fly control inside 
barns where cows are milked, or in 
places onthe farm where milk is proc- 
essed. The concentrations to employ 
and methods of applying the sprays 
have already been discussed. The re- 
sidual sprays may be supplemented 
with mist sprays or aerosol to aid in 
controlling flies. Insecticides con- 
taining pyrethrum or organic thio- 
cyanates are Suitablefor this purpose. 
Use Screens.--Wherever prac- 
tical, install tight-fitting screens in 
windows and doors of milk rooms and 
other farm buildings. 
