l62 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



an untreated tree in other orchards or another section of the 

 residential ,district, at a distance varying from about i,ooo feet 

 to two miles. Some varieties of apples were kept in the insect- 

 hoiuse for a month or more so as to give any eggs that were 

 deposited shortly before picking an opportunity to batch and 

 also to bring out more conspicuously the tiny tunneU of the re- 

 cently hatched larvse in the pulp. Each apple was cut in half and 

 if there was no evidence of an infestation, the halves were thinly 

 sliced to determine whether there was any trace ,of the con- 

 spicuous brown tunnels of the larvae in the pulp. In this way 

 a record was taken of the infested and non-infested apples. 

 No attention was paid to egg punctures as the apple fruit fly 

 will sometimes make an egg puncture and not deposit an egg. 



RESULTS IN ORCHARDS. 



The following table showis the per cent of apples infested on 

 the sprayed and check trees in 1914 and 191 5, the dates on 

 *which the apples were picked, the location of the treated trees 

 on the map in the orchards and the varieties of apples : 



I Results of Tma Seasons^ Spraying in Orchards. 



Varieties of Apples. 



Map. 



Picked, 

 1914. 



Picked, 

 1915. 



Apples infested 

 on sprayed tree. 



Apples infested 

 on check tree. 





1914. 



1915. 



1914. 



1915. 



Tolman Sweet* 



Tolman Sweet 



Mcintosh Red 



Tl 

 T2 

 Dl 

 D2 

 Fl 

 F2 

 Ml 

 M2 



Sept. 19 

 Sept.' 19 

 Sept. "29 

 Sept." ' 12 



Sept. 27 

 Sept. 27 

 Sept. 24 

 Sept. 24 

 Sept. 27 

 Sept. 27 

 Sept. 29 

 Sept. 29 



% 

 4 



■ "o"" 

 " "6 " 

 ■ "6 " 



% 

 5 

 3 

 

 1 

 6 

 2 

 2 

 4 



% 

 96 



■" '28'"" 



% 

 100 

 100 





38 

 "92"" 



52 





52 



Milden 



25 





25 







Pyrus prunifolia 



(Hybrid crab) 



P 





Sept. 17 





7 











Rolfe* 



R 

 H 



S 



Sept. 14 



Sept. 8 

 Sept. 17 

 Sept. 17 



14 



1 



24 















1 



Large Red Siberian. . . . 









Bells Early* 



B 



T3 



Sept. 26 

 Sept. 26 

 Sept. 14 



Sept. 12 

 Sept. 27 



55 

 40 

 24 



20 

 3 







Tolman Sweet* 



100 

 97 



100 









Tolman Sweet 



T4 



Sept." " 19 



Sept. 27 



" "4" " 



34 





100 













Wealthy 



W 



T5 





Sept. 24 

 Sept. 27 





57 

 32 







Tolman Sweet 





100 



* Indicates that the apples were picked from the same sjjrayed tree during 1914 and 

 1915, while the varieties not so marked were picked from different trees during the two 

 seasons. 



