52 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



A study of our date of emergence records indicates that in the 

 Ozarks adults may be on wing any time from the last of May to the 

 last of October. In 1911 a cf moth was seen on wing in the orchard 

 on the 29th of May and in 1912 four moths of the 284 recorded in that 

 year's records emerged from October 26-30. In general, however, it 

 will be noticed from the data that 60 to 93 per cent of the emergence 

 takes place within a period of about four weeks — from the middle of 

 August to the middle of September. Before this period emergence is 

 light and sporadic and after this period there are only a few stragglers. 



1910. In the records of this year on 350 insects there was a slow 

 and sporadic emergence up until August 23. An interesting rise oc- 

 curred however, from July 23 to August 5, during which time 25.1 

 per cent, of the emergence of the season occurred. This rise seemed 

 abnormal, and it was at first thought that there might be two broods 

 of borers concerned in this orchard. A study of the 1912 and 1913 

 data, taken in the same orchard, would hardly bear this out. 



After this brief rise emergence dropped off until August 23 when it 

 began to rise abruptly. Within the week following August 23, 27.1 

 per cent of the emergence occurred and from September 1 to 20, 54.3 

 per cent of the moths emerged. After this date emergence dropped 

 off abruptly. 



1911. The data of this year is very meagre and was taken from a 

 different orchard, from which only 63 moths emerged; 48.1 per cent 

 of these emerged from August 23 to September 4, emergence being 

 heaviest from August 29 to September 4. 



1912. Our records of this year are on 284 skins collected from July 

 1 to October 30. Emergence was irregular and scattered until August 

 23 with a slight rise from August 1 to 7, inclusive. From August 

 23-26 only four moths emerged, but within the next three days there 

 was a rapid rise, 34 moths having emerged, and in the three days fol- 

 lowing this, August 26-29, sixty-nine moths emerged. The record 

 illustrates well how rapidly emergence rises, it being 4, 23 and 69 at 

 three-day intervals from August 23. The active period of emergence 

 for this year was from August 27 to September 16, during which time 

 79.5 per cent of the emergence occurred. 



1913. Emergence of this year was made on a basis of 405 moths. 

 As in other years there was a scattered and sporadic emergence up 

 until the middle of August. From August 4-11 only two moths 

 emerged, in the week following 25 emerged, in the four days following 

 this, August 17-21, 34 emerged and in the four days following this, 

 August 21-25, 69 emerged. The emergence of this year was charac- 

 terized by being more concentrated in the period of maximum emerg- 

 ence. This period was steadier and more prolonged than in other 



