BN-2288 
cockroach. (1% 
Australian 
times natural size.) 
Female 
Make limited applications; do 
not treat entire floors, walls, or 
ceilings. Treat only along base- 
boards, under cupboards, and in 
similar places where cockroaches 
hide. Do not treat surfaces used 
for the preparation of food. Do 
not treat storage spaces that 
contain food. 
The following list names the 
most commonly used insecticides, 
gives the proper strength of each 
spray or dust, and indicates the 
effectiveness of each. Dusts can 
be bought already prepared and 
so can oil sprays. Emulsions can 
be prepared easily by following 
the directions on the label. 
CHLORPYRIFOS (DURSBAN): 
0.5-percent oil solution or water 
emulsion. 
DIAZINON: 0.5-percent oil solu- 
tion or water emulsion. 
MALATHION: 2-percent oil so- 
lution or water emulsion; or 4- 
or 5-percent dust. 
PROPOXUR (BAYGON): 1-per- 
cent oil solution or water emul- 
sion. 
RONNEL: 2-percent oil solution 
or water emulsion. 
These insecticides kill the cock- 
roaches present and leave a resi- 
due on the treated surface. The 
residue does not keep cockroaches 
out, but those that come in con- 
tact with it are killed. A single 
treatment in the right places gives 
protection for several weeks. 
A liquid insecticide is often the 
best for use in the home. A dust 
or water-based spray may be used 
when there is danger of fire from 
oil-based liquids. Both a liquid 
and a dust may be used when 
cockroaches are abundant, diffi- 
cult to control, or firmly estab- 
lished. 
APPLICATION 
Whether spray or dust is used, 
treatment should be limited to 
baseboards, cracks, and places 
where cockroaches hide. 
Spray 
Apply a liquid insecticide with 
an ordinary household plunger- 
type sprayer that produces a 
coarse spray to wet the surface 
being treated. If the mist is too 
fine, it will float away in the air. 
Apply enough spray to moisten 
surfaces thoroughly, but not so 
much that the liquid begins to 
drip or run. 
Professional pest-control opera- 
tors may use larger sprayers but 
should make spot treatments only. 
A paintbrush may be used for 
applying the liquids in cracks or 
along baseboards. 
