2O 



A MANUAL OF FORESTRY . 



It has been known to attain a diameter of thirty-two inches 



in seventy-seven years. Unlike some rapid growers the white 



pine lives to an advanced age, occasionally three hundred years 



or more, though trees of that age are now rare. In youth it is 



Hisa-ptible to damage by fire, but as it gradually substitutes 



Fig. 4. A white pine of the best type for lumber; with straight trunk, 

 without dead bram hr-.. 



a thick bark for the thin, green, smooth bark of youth, it be- 

 comes more resistant. 



hiet" native enemy is the white pine weevil, 1 but recently 

 the blister rust disease, 1 has been found so widespread through- 

 out Xew England and eaMcrn \e\v York on its other host, the 

 currant, that the white pine has fallen somewhat into disrepute. 

 1 For a description of the insect and fungus enemies of pine, see Chapter VII. 



