July, 1914.] THE APPLE MAGGOT. 75 



The typical fall apples, such as the Porter, Jersey Sweet or 

 Russet Sweet, show a limited exit of larvae during the first week, 

 the percentages being respectively 1 per cent, .6 per cent, and 

 1.3 per cent. In the second week, if the fruit is of quality that 

 tends to mellow rapidly, as with the Porter, issuance may reach 

 a more rapid rate, passing on to a maximum in the third week. 

 If the fruit is of firmer characteristics the process is slower, and 

 maximum issuance may not occur until the fourth or fifth week. 



With winter fruit the length of time before any considerable 

 exit takes place is greatly prolonged. With Winter Sweet it was 

 found that during the first five weeks exceedingly few larvae issued, 

 although the fruit showed many egg punctures. Issuance then 

 became somewhat more rapid, reaching a maximum the eighth 

 and ninth weeks, but at no time did larvae issue in numbers com- 

 mensurate with the number of egg punctures. 



INFLUENCE OF TIME OF DROPPING ON EXIT OF LARVAE. 



The time when drops fall, whether early or late in the season, 

 has with some varieties a clear influence on the rate of exit of the 

 larvae; and similarly there is with certain types of fruit a marked 

 influence on the total number of larvaB issuing. 



An examination of Table 19 will show that with ordinary sum- 

 mer or fall fruit the larvae issue more quickly from drops that fall 

 toward the close of the season than from those that fall early. 

 With Early Harvest this is not evident, presumably because 

 this fruit, in this experiment at least, mellowed to a marked 

 degree while still on the tree. With Red Astrachan, August 

 Sweet and others, many more larvae issued the first week toward 

 the end of the season than at the beginning. 



With winter fruit there is apparently little difi^erence in this 

 regard between drops falling early and those falling late. 



Table 20, which shows the total number of larvae issuing from 

 early drops as compared with those from late drops of the same 

 variety, gives another aspect of the case. Here we find that 

 usually the earlier drops, especially those of August, if allowed to 

 lie undisturbed, give the maximum total larvae. If the variety is 

 such that the season of dropping extends into fall there is a 

 marked diminution in the total number of larv£e issuing. 



Winter apples falling after the third or fourth week in Septem- 



