488 THE PEAR-BARK LOUSE. 



divided, and the circulation cut off." Thus the 

 whole part above becomes deprived of its necessary 

 nourishment, and dies. The Hon. J. Lowell, of 

 Massachusetts, who discovered this insect, recom- 

 mended the following method for its destruction : 

 As soon as the blight appears, the limb should be 

 cut off below the point of his burrow, and the whole 

 be burned before he has time to come forth as a 

 beetle, and provide for the extension of his race. 

 [Harris). 



(2) The Pear-hark Louse — Secanium Pyri : 

 Schrank. This is similar in its habits to the apple- 

 bark louse ; but it is considerably larger. The 

 remains of the female, under which the eggs are 

 placed, is a brown scale, about one-fifth of an inch 

 in diameter. When this comes off, a white spot 

 of the same size remains, which is easily distin- 

 guished. It is injurious to the tree, because it sucks 

 the sap through the young bark. For methods of 

 destroying* them, see those used for that of the 

 apple. 



(3) Cicada Septemdecim. The puncture of the 

 wood by the locust. Page 462. 



3. Fungus upon the Root Pear trees sometimes 

 do not thrive, notwithstanding they are surrounded 

 by all those conditions necessary to insure health. 

 This is often occasioned by a fungus, which has 

 attached itself to the root and wound around it ; 



