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The tongue depressors may be sharpened on the free end and pushed 

 into the ground at the edge of manure piles, or hung from the cages to 

 a position as near the ground as possible. They may also be tacked to 

 cage supports below and out of reach of the poultry. At least one 

 bait station per 10 feet should be used, and more in places where the 

 flies are congregating. (See photograph on opposite page.) 



Cloth strips, 2 or 3 inches wide and about 30 inches long, treated 

 with the bait paste may also be used as bait stations. These strips, 

 tacked in place, may be useful in localities where flies gather high 

 in a building rather than on and near the floor. They may be made of 

 a cheap grade of cotton or burlap. 



Surface and Space Sprays 



Insecticides may also be used as sprays, either applied to the 

 surface or discharged into the air within the building. In a small 

 poultry house a hand sprayer is satisfactory, but in a large one a 

 power sprayer may be preferable. For applying a space spray a fogger 

 or an aerosol bomb is also suitable. A fogger utilizes the material 

 most economically. 



Surface sprays leave residues that are effective against adult flies 

 for several weeks. Space sprays do not leave satisfactory residues, but 

 will kill flies with which they come in contact. They are most effective 

 in buildings that can be closed tightly. 



All the insecticides listed may be useful in some localities, but 

 house flies are becoming resistant to DDT, chlordane, methoxychlor, 

 lindane, and toxaphene. Space sprays containing pyrethrum plus piperonyl 

 butoxide, propyl isome, or sesame oil are effective against all flies, 

 and some of them also contain small percentages of DDT, methoxychlor, 

 lindane, or malathion. Diazinon, Dow ET-57 (Korlan), chlordane, and 

 toxaphene are not recommended as space sprays. 



Larvicides 



House fly larvae in poultry manure can also be destroyed with 

 sprays. Applications are usually made with hand sprayers and must be 

 repeated every week or two. Water-base sprays have been found to 

 liquefy the manure in many humid localities. Oil-base sprays do not 

 cause liquefaction and are equally effective. 



Impregnated Cords 



In many places cords impregnated with insecticides have been found 

 effective when hung vertically or in loops from the ceiling of the poultry 

 building. Flies resting on these cords are killed because of the residual 

 effect of the insecticide. Residual control lasts 4 to 6 weeks, sometimes 

 longer. In some States these cords may be used only by pest-control 

 operators. 



