48 



INSECTS AFFECTING THE APFLE. 



The adult insect is a small, grayish moth (Fig. 18, 

 d,) that appears during June or July, and deposits 

 eggs on the various trees that serve as food plants 

 for the larva'. These include the apple, quince and 

 possibly the peach, as well as both the wild and cul- 

 tivated varieties of the cherry, plum, and crab-apple. 



From these eggs 

 there soon hatch 

 small 1 > r o w n i s h 

 w o r m s that con- 

 struct tubular, silk- 

 en cases (a) within 

 which they remain 

 concealed when 

 not eating. As they 

 grow larger they 

 d r a w a bout the 

 openings of their 

 abodes many par- 

 tially eaten leaves, 

 so that by autumn 

 there is quite a 

 bunch surround- 

 ing each case (l>). At the approach of cold weather 

 the cases are attached to the twigs by means of silk- 

 en threads, the larvae frequently gnawing away the 

 tender bark to insure a firm hold ; and thus the win- 

 ter is passed. As soon in spring as the leaves begin 

 to appear, the larva? attack them, frequently eating 

 out the flower buds as well. They continue feeding 



Fig. 18. Leaf-crumpler : a, larval case ; 6, lar- 

 val case with dead leaves ; c, front part of 

 larva; d. moth, magnified. 



