32 



it. This is repctitcd until it is entirely within the burrow, when it 

 tuiiis around and spiny a silken net over the hole, in which may be 

 incorporated several pieces of the fruit. (PL IV, fig. 1.) 



Slingerland, Card, and Cordley have also noted these larvte enter, 

 and the observations made by the writer agree entirely with theirs. 

 One of the essential points noted is that while entering none of the 

 larva? seem to eat any of the fruit until well within the burrow, and 

 it most probably gets some of the poison applied in spraying when 

 it attempts to pierce the skin. The writer has observed numerous 

 larger larvte, and is quite positive that they do not eat any of the fruit 

 while thej^ are entering. 



PLACES or ENTRANCE. 



The places of entrance of the successive broods are quite different. 

 Various authors have stated that from 60 to 80 per cent of the larvae 

 of the first generation enter the fruit by the calyx. In 1901 several 

 countings gave an average of 83 per cent, with a minimiun of 79 per 

 cent. In 190'J much more extensive countings gave a maximum of 

 93 per cent, a minimum of 50 per cent, and an average of 81 per cent. 

 (Ta])le III.) Less than one-half of 1 per cent enter b}^ the stem end, 

 while the larger remaining percentage enter the side, especially where 

 fruits touch. 



The majority of the second generation enter the side of the fruit. 

 A few counts in 1901 showed that the greater part of the larvffi entered 

 the side, and a few cases showed that from 90 to 100 per cent had 

 entered at that place. Countings on 1,478 apples in September, 1902, 

 on ])oth sprayed and unsprayed trees, are given in Table III. 



Table III. — Percentage of first r/eneration entering calyx. 

 SPRAYED TREES. 



