14 Farmers' Bulletin 73i 



and preferably one iy2 inches deep, so that a ofreater amount of bait 

 may be used, thus preventinrr complete dryinf; out between visits to 

 the trap. Its diameter should be about 4 inches less than that of the 

 base of the trap, thus bringin*; the ed^e within 2 inches of the out- 

 side edge of the trap. For liquid baits the catch can be increased 

 slightly by placing a piece of sponge or a few chips in the center 

 of the bait pan to provide additional surface upon which the flies 

 may alight. The same kind of pans for bait may be used under tent 

 traps. Two or more pans should be used, according to the length 

 of the trap. 



CARE AND LOCATION OF TRAPS 



In many cases flytrapping has been rendered ineffectual by the 

 fact that the traps were not properly cared for. In setting traps a 

 location should be chosen where flies naturally congregate. This is 

 usually on the sunny side of a building out of the wnnd. It is exceed- 

 ingly important that the bait containers be kept well filled. This 

 usually requires attention every other da3\ The bait pans should 

 be washed out at rather frequent intervals. This gives a larger 

 catch and avoids the danger of flie^ breeding in the material used 

 for bait. Further, it should be borne in mind that traps can not 

 be operated successfully throughout the season without emptying 

 them. Where flies are abundant and the bait pans are properly 

 attended to the traps should be emptied at weekly intervals. AVhere 

 flies become piled high against the side of the cone the catching 

 power of the trap is considerably reduced. The destruction of the 

 flie^s is best accomplished by immersing the trap in hot water or, 

 still better, where a tight barrel is at hand place a few live coals in a 

 pan on the ground, scatter two tablespoonfuls of sulphur over them, 

 place the trap over the coals, and turn the barrel over the trap. 

 All of the flies will be rendered motionless in about five minutes. 

 They may then be killed by using hot water, throwing them into 

 a fire, or burjnng them. In the operation of flytraps in controlling 

 the screw-worm it has not been found necessary, especially during 

 hot weather, to kill the flies, as they die very rapidly within the 

 traps. In order to empty a trap it may be inverted and the dead flies 

 shaken down. As the living flies will naturally go upAvard, the door 

 may then be removed and the dead flies shaken out, the door replaced, 

 and the trap set upright without loss of many of the living flies. 



STICKY FLY PAPERS 



Sticky fly papers are of some value in destroying flies Avhich have 

 gained access to houses, but they have marked limitations and nu- 

 merous objectionable features. For use out of doors traps are much 

 more effective and economical. 



Doctor Crumbine. of the Kansas State Board of Health, gives the 

 following method for preparing fly paper : 



" Take 2 pounds of rosin and 1 pint of castor oil, heat together 

 until it looks like molasses. Take an ordinary paint brush and 

 smear while hot on any kind of paper — an old newspaper is good — 

 jmd place several about the room. A dozen of these may be made at 

 a cost of 1 cent."' 



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