BN—2290 
German cockroach: A, First stage; B, second stage; C, third stage; D, fourth stage; E, adult 
female; F, female with egg case; G, adult with wings spread. (114 times natural size.) 
Fumigation 
Fumigation immediately destroys 
a roach infestation, but it is danger- 
ous in congested or commercial 
areas, and it is expensive. Also, 
buildings in such areas are likely to 
become reinfested within a short 
time. 
Since effective residual insecti- 
cides have become available, fumi- 
gation is seldom used. Only a pro- 
fessional pest-control operator 
should fumigate. 
Boric acid and borax 
Finely powdered boric acid and 
borax (sodium tetraborate penta- 
hydrate) act slowly and are gen- 
erally less effective than other insec- 
ticides against cockroaches. 
These materials are sometimes 
mixed with ingredients that are at- 
tractive to cockroaches, and com- 
pressed into tablets to be used as 
bait. The powders or bait tablets 
may give satisfactory results when 
used in places where there is little 
food for cockroaches, such as in of- 
fice buildings. 
PRECAUTIONS 
Pesticides used improperly can be 
injurious to man, animals, and 
plants. Follow the directions and 
heed all precautions on the labels. 
Store pesticides in original con- 
tainers—out of reach of children 
and pets—and away from foodstuff. 
Apply pesticides selectively and 
carefully. Do not apply a pesticide 
when there is danger of drift to 
other areas. Avoid prolonged in- 
halation of a pesticide spray or 
dust. When applying a pesticide it 
is advisable that you be fully 
clothed. 
Do not apply oil sprays where 
they could be ignited by a flame 
(for example, the flame of a pilot 
hight) or by electric sparks. 
Do not use lindane, diazinon, 
ronnel, or chlordane to treat an 
entire room. Restrict the use of these 
insecticides to places where roaches 
run or hide. 
