These insecticides kill the cock- 

 roaches present, and all except 

 those applied by aerosol leave a 

 residue on the treated surface. 

 The residue does not keep cock- 

 roaches out, but those that come 

 in contact 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-base spray may be used 

 when there is danger of fire from 

 oil-base liquids. Both a liquid and 

 a dust may be used when cock- 

 roaches are abundant, difficult to 

 control, or firmly established. 



For restricted use 



Bayer 39007, trichlorfon (Dip- 

 terex), and fenthion (Entex) are 

 effective, but their application is 

 limited to pest control operators 

 only. 



Application 



Spray 



Apply a liquid insecticide with 

 an ordinary household plunger- 

 type sprayer that produces a coarse 

 spray. 



If large areas are to be treated, 

 compressed-air sprayers, power 

 sprayers, or other special equip- 

 ment may be used. The sprayer 

 should deliver a fairly coarse mist 

 that will wet the surface being 

 treated. If the mist is too fine, it 



Mention of a proprietary product in 

 this publication does not constitute a 

 guarantee or warranty of the product by 

 the U.S. Department of Agriculture and 

 does not imply its approval by the Depart- 

 ment to the exclusion of other products 

 that may also be suitable. 



Oriental cockroach: Above, female; below. 

 male. | 1 '/> times natural size.) 



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. 



A paintbrush may be used for 

 applying the liquids in cracks or 

 along baseboards. 



Dust 



Apply a dust insecticide with a 

 puff duster of the bulb, plunger, or 

 bellows type. Blow the dust into 

 hiding places that are hard to 



