INSECTS INFESTING FRUIT TREES. 



THE APPLE.— Pyrw^ Malus. 



AFFECTING THE ROOT. 



1. Appleroot blight, Pemphigus Pyri, Fitcli. (Homoptera. Aphidae.) 



Wart-like excrescences growing upon the roots, sometimes of an 

 enormous size; containing in their crevices exceedingly minute 

 pale yellow lice, often accompanied with larger winged ones, 

 having their bodies covered with a white cotton-like matter. 



The mature, winged insect, a black fly with a dull greenish 

 abdomen and the wings transparent but not clear and glass-like, 

 with a faint smokiness at their tips, in the cell or space inclosed 

 by the last of the four oblique veins. Length to the end of the 

 wings nearly or quite a quarter of an inch, (0.25.) See Tran- 

 sactions of the New- York State Agricultural Society, 1854, page 

 709. 



AFFECTING THE TRUNK. 



r 



Worms beneath the barky mining cavities in the outer sap wood and boring holes 

 in the heart wood. 



These are the most pernicious enemies which the apple tree 

 has, whole orchards of young trees, if neglected, being almost sure, 

 of late years, to become suddenly infested and destroyed by one 

 or more of these insects. 



2. Apple tree borer, Superda bivittata, Say. (Coleoptera. CerambyciJa}.) 



[Plate I, fig. 2.] 



A hirge cylindrical wliite footless grub, rather oroadest ante- 

 riorly, its head cliestnut brown, its mouth black. Excavating 



[Ag. Trans. J U 



