136 



lo which thc}' fasten fragments of leaves, thus forming- small port- 

 able cases ( Fig. 23, 24, 22 /") . As 

 they hatch in large numbers 

 ,^ :^^^^ from a single egg-case they may 



become ver}' abundant on a tree 



and do it serious injury. It is 



.^A^ unlikely that any careful nursery- 



Fiti' 



Fig. 24. The I5a(; worm; 

 completed case 

 of larva, from 

 apple. 



man will send out on his trees 

 such conspicuous masses of in- 



arvii- at work, and one sect eggs. They should, of course, 

 of the cases enlarged. ^^ ^^^^^^ ^^ ^^^ destroyed, if an 



earlier insecticide operation, such as spraying with Paris green, 

 has not killed the caterpillars before they cease to feed. 



Thk Tussock-moth. 

 {Notoiophus Iciirostii^Dia. ) 



This notorious shade-tree pest is in-jurious also to the apple, 

 but it is mainly known for its 

 injuries to ornamental trees in 

 towns. In the winter, masses 

 of eggs of this insect may be 

 found fastened here and there, 

 with a dead leaf or a cluster 

 of such leaves, to the branch of 

 a tree and attached to an empty 

 gray cocoon (Fig. 25). A single 

 cluster mav contain from three Fig. 25. im Iiss.mk moth; cocoon of 

 , J J " - , • lemale and frotiiy egg-mass 



hundred to hve hundred white, laid by her upon it. 



