INSECTS, DISEASES, AND INJURIES 



127 



been added as a marker. It is also good practice to band the 

 trunks with "tree tanglefoot" to prevent the ascent of mi- 

 grating caterpillars. 



The white fine weevil {Pissodes strohi. Peck). Figs. 10, 11. 



White pine is subject to the attacks of a weevil which kills 

 the central leader or topmost shoot, thus ruining the symmetry 

 of the tree and caus- 

 ing the trunk to be 

 crooked and mis- 

 shapen. The parent 

 insect is a small brown 

 snout beetle with a 

 whitish spot near the 

 hind end of each 

 wing-cover. The 

 beetles emerge from 

 hibernation in May 

 and, after feeding for 

 a time on the terminal 

 shoot, they deposit 



.1 • • 10. Work of the white pme weevil. 



then* eggs m punc- ^ 



tures in the twig. The eggs hatch in a few daj^s and the larvae 

 burrow in all directions through the shoot, riddling the tissue 

 and causing the death of the branch. The grubs become full 

 grown in August and the beetles emerge in early fall and go 

 into hibernation under trash and in similar sheltered places. 

 There is only one generation a year. 



Much may be done to keep the weevils from injuring the 

 pine leaders by spraying this part of the tree about May 1, 

 before the new leaves appear, with lime-sulfur solution — one 

 part in eight parts of water. This acts as a deterrent and 



