June, '14] 



HEWITT: HOUSE-FLY CONTROL WORK 



287 



Emergence of Flies 



The following table summarizes the results of these experiments 

 which have been arranged in order according to the number of flies 

 emerging from the various piles. 



EXPERIMENTS WITH LARVICIDES 



From the foregoing experiments kerosene emulsion appeared to be 

 the most effective insecticide. I am inclined to believe, however, 

 that the greater proportion of straw in this experiment, No. 11 (6), 

 affected the results, and I should be inclined to prefer the chloride of 

 lime treatment pending further results, especially as kerosene emulsion 

 is considered, I believe, by chemists to affect the manurial values of 

 the stable refuse. 



These preliminary results, however, are not given for the purpose 

 of drawing conclusions as to the best insecticide, but rather to indicate 

 a method wherebj^ such results may be obtained. 



Pupation 



Among the miscellaneous observations made during the past season's 

 work, the following may be mentioned: It was found that the 

 mature larvge generally left the manure heap to pupate and buried 

 themselves in the sand some distance away from the heap. That 

 the majority of the larvae travelled some distance before pupating is 

 demon.strated in the following table in which it is seen that in the 

 aggregate a greater number of flies were captured in the bottotn cages, 

 that is, the cages attached to the cheese cloth outside the wooden 

 covers, in which cages the flies emerging from pupse outs-ide the wooden 

 covers were captured. 



In the cages on the top of the wooden covers, referred to as the top 

 cages, the flies emerging from pupse M-ithin the sides of the wooden 

 covers were captured and these were less in number than the flies 

 emerging from pupae outside the wooden covers. 



Larvse were found pupating at a distance of tw^o feet from the manure 

 pile and at a depth of nine inches. 



