The Canadian Horticulturist. 215 



tion, and removing and burning all the withered tips, down to the lowest ring, 

 so as to insure the destruction of the eggs. The natural home of this insect is 

 among the wild raspberries. The perfect insect is one of the long-horned 

 beetles, known to entomologists as Oberea bimaculata, and has a long, narrow 

 black body with the tip of his thorax and the fore part of his breast pale 

 yellow. The beetles are on the wing during the month of June. The eggs are 

 laid between two rings, made by the insect somewhere near the top of the cane> 

 and, as a result of the stoppage of the sap thus caused, the tip of the canes, 

 above the upper ring, begin to wither and shortly afterwards die. The young larva 

 burrows down the centre of the stem, consuming the pith until it is fully grown, 

 which is usually about the end of August, when it is nearly an inch long. 

 Here it remains during the winter, changing to the pupa state. The beetle 

 escapes in the month of June following, by gnawing a passage through the cane. 



GRAFTING DIFFERENT SPECIES. 



Sir, — I have one dozen pear trees I wish to change. Will apple grafts succeed well on 

 them, such as Baldwins, Wagners, Ontario and Mcintosh Red ? If not, why, and what 

 will ? Also five cherry trees I wish to change. Will plums do well on them, and if not, 

 why, and what kind will ? Are the Ontario, Mcintosh Red, and Red Canada, winter 

 apples? Please answer through Horticclturi^t, and oblige, 



Wm. E. Browx, Blyth, Out. 



The varieties mentioned are all winter apples. The apples would not succeed 

 very well on the pear stock, nor the plum on the cherry. They would live for a 

 time, and be a kind of curiosity ; but very little more. The reason is that the 

 texture of the wood and the habit of growth is somewhat different in each, so that 

 the same perfect union is impossible, as that which takes place when stock and 

 scion are the same kind. Of course special objects are sometimes gained by 

 grafting different kinds, as the pear on quince stock, to dwarf it, the peach on 

 plum stock for hardiness, or to adapt it to a heavier soil ; or the pear on the 

 Mountain Ash, to adapt it to dry light sandy soil. 



MIXING VARIETIES. 



Sir, — A discussion arose between a few Meaford subscribers of the Horticultcrist about 

 potatoes, some asserting that, if different varieties were planted in alternate rows, they 

 will mix ; others saj' they will not, and that, no matter how many kinds were planted 

 together, they will keep as separate as if planted in different fields. We agreed to refer 

 the matter to you for solution, Thos. PirNKEXT, Meaford. 



No. Potatoes will not mix by planting varieties near each other, because 

 the tubers are not the seed ; they are simply enlargements of the root, and are in 

 no way affected by the pollen. The seeds, which are grown on the potato stalks 

 above ground, will mix, when fertilized in this way, by the pollen of another kind; 

 and, if sown, will give rise to new varieties. 



