152 Maine: agricultural, experiment station. 19 16. 



and ten trees in 1913. In the above spraying experiments, dif- 

 ferent proportions of arsenate of lead arid molasses diluted 

 with water were employed. The results are given in the table 

 which follows. 



Table showing the number of applications of the spray, the 

 variety of apple trees, and the per cent of apples fY>&e from 

 egg punctwres on the sprayed trees and on such check or* 

 control trees as mere used. 



Applica- 



Varieties op Apples. 



Apples free from egg 



punctures on sprayed 



tree. 



Apples free from egg 



punctures on check 



tree. 



Bpray. 



Drops. 



Picked. 



Drops. 



Picked. 



3 



1910 

 Winter Sweet 



% 

 14 (dr 

 



55.8 

 55.8 

 46.4 



39.3 



ops or pick 

 8.1 



46.1 

 59. 



74.7 







3.7 

 11.7 

 15.6 

 11.9 



9. 

 34.8 

 27.9 

 87.3 



% 

 ed?) .5 



52.7 



22.6 

 *8.5 



% 



4 







10 



1911 





7 







9 







5 



1913 



32.8 



7 



Porter 



* 8 



4 



Williams Favorite 







4 







3.5 



7 











 





7 



Porter 





7 



Porter 



.4 





10 





68.9 



10 









68 9 



10 









68.9 













* Indicates that an ' ' unknown sweet ' ' was used as a check for the t'orter. 



The author summarized the above results as follows: 

 "Poison bait sprays, as so far devised, have entirely failed to 

 insure protection of the fruit of the sprayed trees from attack 

 by the maggot. In part of the experiments there was appar- 

 ently some improvement of the fruit, especially in isolated 

 trees. This may have resulted from the death of flies because 

 of the spray ; or it may have been due to various other factors. 

 The important point is that no such protection was forthcom- 

 ing as would be essential if the treatment were to be ranked as 

 an effective means of control." 



"The above conclusions should not be taken as asserting that 

 no flies are poisoned by such sprays. Some flies may be. In- 



