300 



The Canadian Horticulturist. 



Such is a brief outline of a plan which I have practised 

 for many years, and know it to be easily worked, cheap, 

 and very efficacious. 



Simply stated, it is to destroy injurious insects only in 

 such a way as not to destroy nor injure their natural 

 insect parasites, and to preserve parasitic species in every 

 possible way. 



Wm. Brodie. 

 Toronto, Ont. 



Fig. 75. 

 A Species of Ormyrds 



THE PITHY GALL OF THE BLACKBERRY. 



In connection with Dr. Brodie's 

 valuable article regarding the rasp- 

 berry gall-fly, it may be interesting to 

 call attention to another species of 

 the same genus, Diastrophus nebulo- 

 sus, which sometimes causes a curious 

 gall on the blackberry canes, such as 

 is shown in Fig. 76. If cut open 

 transversely, it will be found to contain 

 a number of oblong cells, about one- 

 eighth of an inch long, each contain- 

 ing a single larva. The latter remains 

 in this state till toward spring, when it 

 pupates, and the perfect insect appears. 

 Pig ye. The fly is described by Prof. Saunders 



as about i ^^ of an inch long, black, 



with transparent wings, and red feet and atenna;. Parasitic insects also prey 



on this as well as on the raspberry gall-fly. 



The Souvenir de Congres is a beautiful pear, and "takes" with the 

 market, but the fjuality, according to a writer in the Ru nil New Yorker, is "so 

 miserable that it ought to have some distinguishing mark, warning uninformed 

 people against it." This pear is among the varieties recently being shipped to 

 London, England, from California. 



For Street Shade Trees, the same writer condems the soft maple as 

 being very brittle, and easily broken down by ice storms or heavy winds. The 

 elm, hard maple, tulip and white ash are considered more desirable. In our 

 opinion the elm is the finest of all. 



