FARMERS’ 
BULLETIN. 
WasuineTon, D. C. 734 JUNE 10, 1916 
Contribution from the Bureau of Entomology, L. O. Howard, Chief. 
CONTENTS. 
Page. Page 
Introduction >: Spe Ses tei. ee eee 1 | Care and location of traps..............-...-. 12 
kings offliescaught-c. 926 Ao oer. oo) os Se AS MCey iyi PADenssas cee. ke eeeme 2.8 12 
BYES CMULADSs veces see as ois 2 See Sn iP EOISONGCIDAILS: arm eae. ~.  Oe. s 13 
matisdor tyaps. =f! fey deere ce bs. . 5. 222555: Oss Canton ser: 2. Fee sae oe 2 Pas e Ht 3.5.3 13 
Bait containers. 25... . ost dace de aesace 12 
FLYTRAPS AND THEIR OPERATION. 
By F. C. BisHopp, Hntomological Assistant. 
INTRODUCTION. 
Flytraps have a distinct place in the control of the house fly and 
other noxious fly species. There is a general tendency, however, for 
those engaged in combating flies to put too much dependence on the 
flytrap as a method of abating the nuisance. It should be borne in 
mind that flytrapping is only supplementary to other methods of 
control, most notable of which is the prevention of breeding either by 
completely disposing of breeding places or by treating the breeding 
material with chemicals.? 
It may be said that there are two main ways in which flytraps are 
valuable: (1) Catching flies which come to clean premises from other 
places which are insanitary and (2) capturing those flies which in- 
variably escape in greater or less numbers the other means of destruc- 
tion which may be practiced. Furthermore, the number of flies 
caught in traps serves as an index of the effectiveness of campaigns 
against breeding places. 
1 Results obtained in experiments with the use of chemicals against fly larve in manure 
are presented in Bulletins Nos. 118 and 245 of the Department of Agriculture. The biology 
of the house fly and the various methods of control are discussed in Farmers’ Bulletin 679. 
Nore.—tThis bulletin is intended to give directions for the use of a supplementary means 
of controlling flies; it is adapted to all parts of the United States. 
38492°—Bull. 734—16 
