228 THE APPLE CULTURIST. 



they found congenial quarters, it has frequently appeared 

 that the increase has been without a parallel. But noxious 

 insects are sometimes an incentive to prompt indifferent 

 pomologists to dispute their right to the growing fruit. 

 The "American Entomologist" affirms that more than two 

 dozen species of noxious insects among which the varie- 

 ties are unknown, as to numbers are now met with as 

 formidable depredators in the apple-orchards of many of 

 the States. Some subsist upon the root ; some burrow into 

 the trunk; some infest the bark; some select the opening 

 buds ; some devour the expanded foliage ; and others, final- 

 ly, revel upon the fruit. Thus beset by enemies on every 

 side, it would seem that the good old apple-tree must ere 

 long succumb, and cease to occupy its place in the family 

 of plants ; and this would undoubtedly be the case if all 

 these enemies were permitted to go on unchecked in their 

 operations. But owing to the incessant antagonism of 

 parasitic foes, insectivorous birds, and human ingenuity, 

 the ravages of these insects are kept within bounds, and 

 the apple-tree still lives. Of these numerous enemies of 

 the apple-tree, five hold a bad pre-eminence namely, the 

 Round-headed Borer (Saperda bivittata), the Oyster-shell 

 Bark-louse (Aspidiotus conchiformis), the Canker-worm 

 (Anisopteryx vernata), the Tent-caterpillar (Clisiocampa 

 Americana), and the Apple-worm (Carpocapsa pomonella). 

 Of these the most conspicuous, and in some seasons and lo- 

 calities the most destructive, is the insect generally known 

 as the Tent-caterpillar (Fig. 95, p. 253). 



The true Way to exterminate Depredators. We might 

 swell this volume to hundreds of pages touching the natu- 

 ral history, habits, and metamorphoses of noxious insects, 

 worms, and caterpillars, all of which would be interesting 

 and instructive; but the great practical consideration is, 

 will such a fund of information render any practical aid in 



