THE APPLE. 71 



The scurfy bark louse is distinct from the 

 preceding and a smaller scale. But its habits 

 are so similar that the same remedies may be 

 applied. 



Twig borers and primers, leaf rooters, crum- 

 plers, and other caterpillars, are to be watched, 

 if in any sections they become troublesome. The 

 palmer worm is of rare occurrence, and would 

 doubtless succumb to arsenic in the form of 

 Paris-green. 



Diseases of the apple, aside from the attacks 

 of insects, are quite limited in number and effect. 

 A blight, akin to that of the pear, prevails to 

 some extent in some sections, but shows itself 

 upon the limbs, and is pretty certain to be ar- 

 rested by a quick removal of the affected part. 



Parasitic fungous growth is comparatively 

 harmless to the apple, so far as is at present 

 known. 



