THE MONTHLY BULLETIN. 157 



the fruit on the sixteenth row eontainerl niap:,£?ots; the other check 

 rows showed less and less infestation, the nearer they were to the 

 sprayed trees. The fruit from the last sprayed row (11) was almost 

 equally infested with that of the first check row (12). 



All the evidence, therefore, appears to show that the flies are easily 

 poisoned, and that they travel about from tree to tree for a considerable 

 distance from the place where they first emerge. Flies from the check 

 trees evidently went over to the sprayed section and deposited a few 

 eggs before they finally succumbed to the poison. This seems to be the 

 only way of accounting for the greater infestation of the last sprayed 

 row. 



SUMMARY. 



From the foregoing it would appear that the cherry fly can be con- 

 trolled successfully, but as some insects are more easily attracted by 

 sweet substances than others, it is doubtful if this remedy would apply 

 in all cases. However, with the insect under consideration, specimens 

 reared in confinement have proven very easily attracted by sugar water 

 placed in the breeding jar. Whether this would hold good under field 

 conditions I am unable to say, but at least it should prove a very 

 interesting and inexpensive experiment for some one who is properly 

 situated. 



The records at this office show that adults emerged, under laboratory 

 conditions, from February 23d to March 11th, but emergence under 

 field conditions would undoubtedlv be later than this. 



