FRUIT-TREE LEAF ROLLER 



95 



from the cocoons late in May or in June, and the female, a few 

 days after emergence, lays from two hundred to three hundred 

 eggs on the under side of the leaves, usually only one or two on a 

 leaf. From ten to twelve days are required for hatching. 



FIG. 116. A leaf-roller. 



. 117. Larva of leaf-roller on leaf. (Herrick 

 and Leiby, Cornell Bull., 367.) 



Control. Hand picking of the larvae is probably sufficient. 

 Insectivorous birds attack the larvae. Parasitic insects, both 

 Ichneumonids and Tachinids, are natural enemies. 



The Fruit=Tree Leaf Roller (Archips argyrospila Walk.). 

 This insect is a gen- 

 eral feeder on apple, 

 pear, plum, cherry, 

 and a host of other 

 trees (Fig. 116). It 

 has become one of seri- 

 ous importance. Pri- 

 marily it is a pest of 

 the apple, folding the 

 young leaves and ty- 

 ing them together with 

 silk, the larva feeding 

 without this nest (Fig. 

 117). Then the bios- 



crvm tAm nffpr onrl FIG. 118. Work of leaf-roller larva on aoples. (Herrick 

 er > ailC and Leiby, Cornell Bull., 367.) 



later it gnaws the 



young fruit (Fig. 118). Much of this injured fruit never matures; 



that which does is deformed and is unmarketable (Fig. 119). 



Life History. Eggs are deposited during the summer on bark 

 of twigs. The caterpillars emerge the following spring. Pupation 

 takes place within a folded or rolled leaf, the pupa lasting about 

 eleven days. The moth, measuring about one inch from tip to 



