96 



THE CANADIAN HORTICULTURIST. 



Fig. T753. Work of Borers on Mapi.e Shade Trees. 



pupal condition is seldom 

 seen, because it does not 

 remain a pupa for any 

 length of time. (Fig. 

 1752-) 



Near the end of June 

 the beetle lays her eggs 

 close to the ground on 

 the trunk of the tree, un- 

 der some loose bark. 

 The young grub or larv^a 

 eats its way through the 

 bark into the sap-wood, 

 where it remains usually 

 a year, then it bores up- 

 wards into the hardwood, 

 whence it emerges as a 

 beetle after a sojourn of 

 nearly three years. The 

 last month prior to emer- 

 gence from the tree is 



spent as a pupa at the upper end of 

 its burrow. The tunnel in the sap- 

 wood is flat, and is usually nearly filled 

 with sawdust castings. 



The beetle emerges about the middle 

 of June, and proceeds with all dispatch 

 to prepare for the laying of the eggs. 

 Figures 1753 and 1754 show very 

 clearly the characteristic markings 

 these beetles make upon trees. The 

 owner of the trees tried to cut out the 

 grubs, but this method produced the 

 ugly, big scars which made the trees 

 unsightly. The adoption of this 

 method of treatment, supposes that an 

 ugly shade tree is preferable to a dead 

 or dying one. The best remedy is 

 a combination of preventive an-d de- 

 structive measures. In the fall the 

 trees should be carefully examined, 

 and whereever there are indications 

 of sawdust, the tunnels should be 

 probed with a stout wire so as to kill 

 the grub. Again in June the trunks 

 of the trees should be treated with a 



Fk;. 1754. Work of Borers on Maple Shade Tree 



