. The Canadian horticulturist [monthly], 1892. Gardening; Canadian periodicals. 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, Fig. 75. A Species of Ormyrds THE PITHY GALL OF THE BLACKBERRY. In connection with Dr. Brodie's valuable article regarding the rasp- berry
. The Canadian horticulturist [monthly], 1892. Gardening; Canadian periodicals. 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, 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original St. Catharines, E. S. Leavenworth
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