42 X. H. AGR. EXPERIMENT STATION. [Bulletin 171 



mellow. The apples were secured from the Beauty Hill locality 

 August 8, 1912. The lot consisted of about three-fourth bushel. 

 The fruit was badly infested and maggots were maturing. The 

 apples were placed on sod at Durham, under an ash tree, in 

 partial shade. They were covered with a screen wire cage and 

 maintained under careful observation until November 15. No 

 flies emerged in 1912. In 1913, 284 flies emerged in this cage. 

 The detail emergence record of these is given in Table 4, column 3. 



In 1913 various lots of infested apples were brought to Durham 

 for the counting of egg punctures in connection with other 

 experiments. These included 6 lots of Porters. The dates 

 when the lots were collected were August 20, 2 lots, August 21, 

 4 lots. These were placed on sod, in the open, and covered with 

 wire screen cages. No flies appeared from these in 1913. 



Two special lots of early infested apples were secured in' 1913, 

 brought to Durham, and kept under careful observation to 

 detect any emergence of adults the same season, if such took 

 place. One lot consisted of August Sweets, collected at the 

 Beauty Hill locality and brought to Durham August 5, 1913. 

 The other consisted of an early sweet apple of unidentified variety 

 and were collected August 12, 1913. In both cases the apples 

 were well infested with maggots. Each lot was placed on un- 

 disturbed soil in the open. Each was covered with a large cage 

 of screen wire. The cages were kept under careful observation 

 through the remainder of the season. No flies were observed in 

 either cage. 



Further south in the range of the apple maggot it is possible 

 that a partial second brood may occur. Illingworth (34, p. 147) 

 describes some experiments conducted at Ithaca, N. Y., in 1911 

 in which adults emerged in September and October. Six experi- 

 ments are noted. In five of these, the first, second, third, fifth 

 and sixth, it is stated that the experiments were conducted in 

 the insectary, or that the soil containing the pupse was covered 

 with a "cylinder jar," or both. If a glass insectary of enclosed 

 type is referred to, abnormal temperatures would probably 

 occur within during midsummer. If the "cylinder jars" were of 

 glass and received any direct sunlight, similar abnormal condi- 

 tions would follow. It appears possible, therefore, that in these 

 experiments development was accelerated and the emergence 



