131 



ment and other debris. The horn-shaped case, open at one end 

 and tapering" to a point at the other, is neatly lined with silk. It 

 is leng^thened as the larva g-rows, by addition to the open end, and 

 thus is considerably longer than the caterpillar when this is full 

 grown. 



Of course a nursery tree should never be sent out with these 

 webbed nests upon its bark. By a little attention when the trees 

 are dug* and stored the nests may be easily picked off. The insect 



often becomes 

 destructively 

 numerous i n 

 the nursery 

 rows, doing" se- 

 rious damag-e 

 to the stock. 

 In that case it 

 may be de- 

 stroyed at 

 small expense 

 by sending" 

 boys throug"h 

 the nursery 

 rows after the 

 leaves have 

 fallen, with in- 

 structions t o 

 pick off and 

 collect every 

 clinging" tuft 

 of leaves or 

 rubbish. They 

 should then be 

 thrown upon 

 the ground at 

 some little dis- 

 tance from an}' 

 fruit tree to in- 

 sure the death 



of the caterpillar without destroying" the parasites by which many 

 of them will be infested. A cheap and effective remedy is the spray- 

 ing" of the infested trees in early spring", just as the young" leaves 

 appear and before the blossoms open. Experiment has shown 

 that a single spray of Paris g"reen and lime (one pound of each to 



Fig. 17. 



The Leaf-CRUMPLER; tube clusters in winter, 

 containing living larva'. (Stedman.) 



