CONTROL OF THE HOUSE FLY AND RELATED FLIES 159 





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Plate VII. — Road drag in use scraping manure in a cow lot on a Tennessee farm. 

 (Bishopp.) 



Pi.ATf; ^'I^. — Undesiral)Ie conditions wliicli are overcome by use of tlie maggot trap. 

 A manure pile covering a large area and having little depth. Illustrating the 

 conditions which favor the greatest loss of nitrogen, and at the same time offer 

 the best breeding ground for flies. (Hutchison.) From U. S. Dept. Agr. Bull. 

 200, Plate III, 



