When you bring baskets, bags, or 

 boxes of food and laundry into the 

 house, look for cockroaches that 

 may be hiding in them, and kill any 

 that you find. 



Sprays and dusts 



Infestations can be controlled by 

 applying insecticides in sprays and 

 dusts. A DDT-pyrethrum aerosol 

 is also helpful. 



Most of the insecticides recom- 

 mended for controlling cockroaches 

 are approved for general use, but a 

 few are restricted. 



For general use 



The following list names the most 

 commonly used insecticides, gives 

 the proper strength of each spray 

 or dust, and indicates the effective- 

 ness of each. Dusts can be bought 

 already prepared. So can most 

 sprays; others can be prepared 

 easily by following the directions 

 on the label. 



Chlordane: 2-percent oil solu- 

 tion or water emulsion; or 5-per- 

 cent dust. . . . Highly effective 

 against all cockroaches except those 

 that have developed resistance to 

 insecticides. 



Diazinon: 0.5-percent oil solu- 

 tion or water emulsion. (See 

 "Resistant Roaches," this page.) 



Dieldrin: 0.5-percent oil solu- 

 tion or water emulsion; or 1-per- 

 cent dust. . . . Same effective- 

 ness as chlordane. 



DDT: 5-percent oil solution or 

 water emulsion; or 10-percent 

 dust. . . . Effective against all 

 cockroaches except those that have 

 developed resistance to insecticides. 

 Less effective than chlordane and 

 dieldrin. 



Resistant Roaches 



Roaches develop resistance to 

 chlordane, dieldrin, lindane, and 

 DDT; resistance is especially 

 widespread in German cock- 

 roaches. 



Diazinon and malathion will 

 control resistant roaches. Ap- 

 ply Diazinon over the infested 

 places as a 0.5-percent emulsion 

 or oil solution spray. Mala- 

 thion may be used at 2-percent 

 strength in similar formula- 

 tions. Also, spot treatments 

 may be made with malathion 

 in a 3- to 5-percent concentra- 

 tion, which should be applied 

 with a brush or sprayed in 

 places where roaches run or 

 hide. 



Lindane: 0.5-percent oil solu- 

 tion or water emulsion; or 1-per- 

 cent dust. . . . Effective against 

 all cockroaches except those that 

 have developed resistance to insec- 

 ticides. Duration of effectiveness 

 shorter than that of chlordane and 

 dieldrin. 



Malathion: 2-percent oil solu- 

 tion or water emulsion. (See "Re- 

 sistant Roaches," this page.) 



Pyrethrum: Liquid or dust. . . . 

 May require more thorough and 

 more frequent application than 

 chlordane, dieldrin, or DDT. 



Sodium fluoride: 50-percent 

 dust. . . . Same effectiveness as 

 pyrethrum. 



DDT-PYRETHRUM AEROSOL: 



Thorough and repeated treatments 

 necessary. 



These insecticides kill the cock- 

 roaches present, and all except 

 those applied by aerosol leave a 



