250 The Canadian Horticjlturist. 



In spring pruning, the vines are usually cut back to within two eyes of the 

 base. These two eyes will produce shoots of which, after they have made a 

 little growth, the weaker should be rubbed off and the stronger one trained up. 

 Now all that remains to complete what is called " summer pruning " is to first 

 pinch off any side shoots which appear during the summer, and any suckers 

 that come up from the roots ; and, in the month of September, to pinch the 

 end of the upright shoot for the purpose of maturing and strengthening it. 



DISEASED PEACH LEAVES. 



Sir, — I enclose you a peach leaf affected by some disease, and I would be obliged to 

 you if you could give me any information concerning it. I think it is caused by an aphis 

 which makes its appearance in midsummer and continues until the autumn, until every 

 leaf is more or less riddled, and I am satisfied that it riddles the tree and exhausts the sap 

 quite as much as the slug does the pear. The fly, when fully matured, has large eyes and 

 nippers and is a very lively and voracious creature, 



R. HoBBS, Av/ikland, New Zealand. 

 Reply by Prof. Fletcher, of Ottmva. 



The peach leaves from New Zealand, sent me by the editor of the Canadian 

 Horticulturist, I referred to Prof. Byron D. Halstead, of New Brunswick 

 N. Y., for his opinion on the species of rust on the leaves. He answers that it 

 is the peach rust (Jniccinia pruni opinosce, pers) in its uredo form. The same is 

 abundant in California. The correspondent spoke of the leaves being riddled, 

 but the leaves sent show no such condition, merely the rust clusters and some 

 small dipterous larvae. I should very much like to see the species referred to 

 with large eyes and nippers ; a few specimens would come easily by mail. 



With regard to the dipterous larvee referred to, I notice, in the February 

 number of the Agricultural Gazette of New South Wales just received, a most 

 interesting article on " Insect Larvae (Cecidomyia) " eating rust on wheat and 

 flax, to which is added at the end a note to the effect that the authors had seen 

 larvae on plum trees feeding on spores oi piiccinia pruni. The letter, coming in 

 just as I had read this article, interests me very much indeed. 



SMALL SIZED TREES. 



Sir, — I received the trees sent out by the Association all right, but the Sari Synap was, 

 poor thing, not fit to be called a tree. Its roots were not thicker than a horse hair, and 

 not more than an inch and a half long. You ought to send out some first-class Russian 

 apple trees of such a size as are sold by nurseries. 



J. Pegg, Kolapore. 



Occasionally we receive complaints from our subscribers concerning the trees 

 and plants sent out by the Association, that they are either too small or they 

 have not come to hand in good order. 



Regarding the first complaint, it needs to be thoroughly understood by all 



