l62 MAINE AGRICULTURAL EXPERIMENT STATION. 1916. 



an untreated tree in other orchards or another section of the 

 residential district, at a distance varying from about 1,000 feet 

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

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

 deposited shortly before picking an opportunity to hatch and 

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

 cently hatched larva? 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 wlas 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 shows the per cent of apples infested on 

 the sprayed and check trees in 1914 and 1915, 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 : 



1 Results of Two Seasons' Spraying in Orchards. 



Varieties op Apples. 



Map. 



Picked, 

 19:4. 



Picked, 

 1910. 



Apples infested 

 on sprayed tree. 



1914. 



1915. 



Apples infested 

 on check tree. 



1914. 



1915. 



Tolman Sweet* 



Tolman Sweet 



Mcintosh Red 



Mcintosh Red 



Tl 

 T2 

 DI 

 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 















% 

 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 







100 

 97 



100 









Tolman Sweet 



T4 



Sept. 19 



Sept. 27 



4 



34 





100 













Wealthy 



Tolman Sweet 



W 

 T5 





Sept. 24 

 Sept. 27 





57 

 32 









100 



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

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



seasons. 



