UNIVERSITY 



Insects Injurious to Fruit Trees, 



APPLE-TREE BORERS. 



THE ROUND-HEADED APPLE-TREE BORER. 



bivittata, Say.) 



Ifc is an admitted fact that apple trees on the ridges 

 are shorter lived than those grown on our lower lands. 

 Hitherto no particular reason has been given for this oc- 

 currence, but it appears to be mainly attributed to the 

 workings of the borer now under consideration. It has 

 been invariably found more plentiful in trees growing on 

 high land than in those on low land, and worse in 

 plowed orchards than on those which are seeded down 

 to grass. Fifty years ago, large, thrifty, long-lived 

 trees were exceedingly common, and were obtained 

 with comparatively little eifort on the part of our an- 

 cestors. They had not the vast army of insect enemies 

 to contend with, which at the present day makes suc- 

 cessful fruit growing difficult. This Apple-Tree Borer 

 was entirely unknown until Thomas Say described it in 

 the year 1834; and, according to Dr. Fitch, it was not 

 until the year following that its destructive character be- 

 came known in the vicinity of Albany, N. Y., for the 

 first time. Yet it is a native American insect, and has 

 for ages inhabited our indigenous Crab-apple trees from 

 which trees Mr. A. Bolter took numerous specimens, in 

 the vicinity of Chicago, ten years ago. It also attacks the 

 Quince, Mountain-ash, Hawthorn, Pear, and the June- 

 berry. Few persons are aware to what an alarming ex- 

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