174 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



At the outset it seemed reasonable to suspect: 



First, that the period after the apple falls and before the maggots 

 begin to leave it would vary with different varieties of apples. 



Second, that the period would vary according to the comparative 

 maturity of a given kind of fruit. 



Third, that it would vary as the general season advanced. 



With these possibilities in view the experiments were laid out as 

 follows : 



Infested trees were selected representing ten varieties of apples, 

 ranging from early or summer fruit to winter varieties. 



All the drops under all of these trees were gathered daily and weTe 

 then so disposed as to afford the following information for each of 

 the ten varieties : 



First, the number of drops gathered each day. 



Second, for each successive week throughout the season, the total 

 number of larvse issuing within the first twenty-four hours from the 

 time the apple falls. 



Third, the same for the second twenty-four hours, the third twenty- 

 four hours, and so on up to the eighth day. 



Fourth, throughout the season selected lots of apples were kept under 

 observation until they rotted, and data recorded showing the number 

 of larvse issuing the second week after the apple falls, the third week, 

 and so on. 



The ten varieties considered in the experiments were as follows : 



1. Early Harvest, season, late July and early August. 



2. Red Astrachan, season, late July to September. 



3. August Sweet, season, August and early September. 



4. Sops-of-Wine, season, August to early October. 



5. Porter, season, September to November. 



6. Russet Sweet, season, September to November. 



7. Jersey Sweet, season, September to November. 



8. Gravenstein, season, late September to November. 



9. Westfield, season, October to winter. 

 10. Winter Sweet, season, October to winter. 



The number of drops observed averaged about two thousand for 

 each variety. The total number was 20,230. In considering certain 

 results the Russet Sweet is omitted because the trees of this variety 

 proved to be rather sparingly infested. 



Summaries only of typical varieties will be given here. 



The August Sweet is a good example of an early or summer apple 

 quite generally infested. In this apple, at the beginning of the sea- 

 son, a few maggots emerged from drops within the first seven days, a 

 very small number within the first and second twenty-four hours. 



