Qe 
nonabsorbent surfaces less spray will 
be required and the concentration of 
the insecticide should be increased. 
Compressed-air hand sprayers may 
be used for small spraying jobs; how- 
ever, power sprayers are suggested 
for most purposes. The pressure 
Should be adjusted to 100 pounds per 
Square inch or less. 
DDT and methoxychlor are avail- 
able as 50-percent wettable powders 
and as 25-percent emulsion concen- 
trates. If a wettable powder is used, 
a spray containing 2.5 percent of the 
insecticide is recommended. Tomake 
this concentration, add 40 pounds of 
50-percent wettable powder to 100 gal- 
lons of water, or for small quantities 
2 pounds to 5 gallons. On most sur- 
faces sprays made from DDT or 
methoxychlor wettable powders are 
more effective than emulsion sprays. 
The emulsion concentrates contain 25 
percent of the insecticide. To make 
100 gallons of a 5-percent spray, add 
20 gallons of the emulsion concentrate 
to 80 gallons of water; to make 5 gal- 
lons, addi gallonto4 gallons of water. 
3 Chlordane is available as emulsion 
concentrates that require dilution with 
water to make the desired concentra- 
tion of finished spray. A 2-percent 
spray is recommended for most situa- 
tions. Asthe percentage of chlordane 
in the commercial products varies, 
follow the directions on the label for 
making the desired concentration of 
spray. 
