July, 1914.] 



THE APPLE MAGGOT. 



51 



apples before the beginning of emergence of the flies. In an 

 orchard at the Sunnyside locality similar preparations were 

 made with 5 trees of the following varieties: Red Canada, a 

 variety known locally as Sweet Longworth, Baldwin, Maiden 

 Blush and August Sweet. Each orchard had a record of bad 

 infestation by the apple maggot. 



Beginning with June 27 one bag was removed on each tree, 

 and the fruit was allowed to remain exposed for one week. At 

 the end of that time the bag was again placed in positioUj that 

 particular cluster of fruit remaining enclosed for the remainder 

 of the season. At the same time a bag was removed on another 

 cluster which was given its week of exposure to egg-laying flies; 

 and so on through the season. 



There was of course considerable dropping of apples within 

 the bags, and the fruit did not ripen in normal manner or with 

 normal color. Nevertheless the apples were found by flies, eggs 

 were laid, and it was demonstrated that in the season in question 

 the egg-laying period began not later than July 4 and ended not 

 earlier than September 19. The earliest recorded emergence 

 of flies in 1910 was June 26. This was beneath an infested apple 

 tree, and in normal surroundings. 



The detailed record of the bagged clusters is given in Table 5. 



Table .5. 



Egg-Laying in Bagged Clusters Exposed for Periods of One Week. 

 (Each cluster remained bagged throughout the remainder of the season.) 



