THE CARE OE SHADE TREES. 



95 





v>%''^ 





Fig. 1752. Round Headed Apple Tree Borer — a, larva or grub: <>, pupa; 



c, adult beetle ; </, puncture in which e%% is laid ; i', same in section ; f and 



g, eggs ; ^, hole from which beetle has emerged ; /, tunnel in wood ; 



y, pupa in its cell in tunnel prior to emerging. 



THE CARE OF SHADE TREES— H. 



'N a previous article I dealt briefly with 

 the physiologfical conditions which aff"ect 

 the healthy, vigforous g-rowth of shade 

 ^;:^ trees. In this present article I shal' 

 deal with the insects which work injury to 

 these trees. 



The insects which attack trees may be 

 divided into three gfroups, vix., Borers, Leaf- 

 caters^ and Sap-suckers. The Borers are 

 chiefly the g-rubs of beetles; the Leaf-eaters 

 are chiefly lamellicorn beetles, and the cater- 

 pillars of certain moths, and the Sap-suckers 

 are hemipterous, or half-winged insects. .A 

 knowledg-e of the life-history of these injur- 

 ious forms is of gfreat service in the figfht 

 ag-ainst them, and can readily be obtained 

 by a reading- of the standard works on Insects. 



I . The chief Borers are the Roiind-Headed 

 and the Flat-Headed Borers. The Round- 

 Headed Borer {Saperda Candida) is perhaps 

 well known to many of the readers of this 

 mag^azine, but for the benefit of those who 

 are not yet acquainted with the pest, I shall 

 g-ive a few facts about its life-history and 

 general appearance. 



The beetle is about an inch in length, and 

 has a broad, white stripe running lengthwise 

 along each wing-cover. The general color 

 of its upper surface is light brown. Its 

 feelers are quite long and jointed. The grub 

 is over an inch in length when full-grown, 

 and has a peculiar shaped head, which is 

 quite characteristic, rounded, and much 

 greater in diameter than the body. The 



