GIRDLING THE TWIGS 



251 



by the beetle, 



Fig. 



usually deep enough for the twig to break entirely off. 

 The beetles are at work in late summer. 



After girdling a 

 twig the beetle lays 

 eggs in it, and the 

 larvae bore in the 

 twig, becoming full 

 grown the following 

 summer. There is 

 only one generation 

 each year. 



335. — The Twig-girdler. 

 Original. 



Where young trees are seriously attacked, the 

 beetles should be hunted out and destroyed. All 

 twigs cut off should be 

 gathered up and burned. 



The Twig-pruner 



{Elaphidion villosum Fab.) 



Fig. 336. — Work of 

 the Twig-girdler. 

 Original. 



Fig. 337. — Work of 

 the Twig-pruner. 

 Original. 



Various kinds of fruit and 

 shade trees sometimes suffer 

 the loss of terminal twigs, girdled by this insect. 

 The work is done by the larva or grub of an 

 elongate, dark brown beetle, a half to three 

 fourths of an inch long. Eggs are laid in the 

 twigs in July, and the grub feeds within, finally 

 gnawing a circu- 

 lar groove as far 

 as the outer 

 bark, so that the 

 twig breaks off, 

 taking the grub 

 with it. The 

 fallen twig then ^^^ 338. -Adult of the Twig- 

 serves as its pruner. Original. 



