liNFESTING FOREST TREES. 



THE PINE. 



AFFECTING THE TRUNK. 



Patches of| white, flocculent, down-like matter on the smooth hark, covering exceed- 

 ingly minute lice invisible to the naked eye. 



The Pine Blight Coccus Pinicorticis. 



Upon young White Pine trees, especially those which are 

 transplanted to ornament our yards, may frequently be seen a 

 species of blight, showing itself in the form of a white, flocculent 

 cotton or down-like substance growing upon the smooth bark, par- 

 ticularly around and immediately below the axils 

 where the limbs are given off from the main trunk 

 of the tree. Often small white spots of this 

 same substance are scattered irregularly and more 

 or less densely over the whole of the bark from one 

 whorl of limbs to another. It is upon the north or 

 shaded side of the trees that these patches are most numerous, 

 and upon the lower part of the body of the tree, where the foliage 

 of the limbs growing above, produce a, constant shade. Those 

 parts of the body of the tree which are much exposed to the light 

 of the sun are seldom, if ever, coated with any of these spots. 



Where a tree is much coated with this white substance, it be- 

 comes sickly and presents a slender, dwindled appearance, its 

 leaves are short and stinted in their growth, and of a dull green 

 color, and the annual growth of the tree is much curtailed. 



If, with the point of a needle, this white cottony substance be 

 carefully parted asunder, under it, attached to the bark of the 

 tree, may frequently be found theinsect which is the cause of this 



