Ronnel: 2-percent oil solution 

 or water emulsion. (See "Resistant 

 Roaches," page 6.) 



These insecticides kill the cock- 

 roaches present, and all except 

 pyrethrum leave a residue on the 

 treated surface. The residue does 

 not keep cockroaches 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 cockroaches are 

 abundant, difficult to control, or 

 firmly established. 



Baygon, trichlorfon (Dipterex), 

 and fenthion (Entex) are effective, 

 but application of trichlorfon and 

 fenthion is limited to spot treatment 

 by professional pest-control opera- 

 tors. 



APPLICATION 



Whether spray or dust is used, 

 treatment should be limited to base- 

 boards, cracks, and places where 

 roaches hide. 



Spray 



Apply a liquid insecticide with 

 an ordinary household plunger- 



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. 



*r 



BN-2288 



Female Australian cockroach. (IV2 times 

 natural size.) 



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 thor- 

 oughly, 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. 



Dust 



Apply an insecticide dust with a 

 puff duster of the bulb, plunger, or 

 bellows type. Blow the dust into 

 hiding places that are hard to reach 

 with a spray and onto surfa>ces 

 where roaches run. A light, uniform 

 film is sufficient. Repeat when mois- 

 ture causes the dust to cake. 



Placing a band of dust on the floor 

 around the edges of a room is not an 

 adequate treatment. Many roaches 

 may be able to go from their hiding 

 places to sources of food and water 

 without crossing the band of dust. 



