. The Canadian horticulturist [monthly], 1887. Gardening; Canadian periodicals. 104 THE CANADIAN HORTICULTURIST, According to Prof. Penhallow, of Quebec, 90 per cent, of the fruit of the Walbridge apple was worthless from the scab last year in that province. And now, with great dismay, we notice that it is attacking our favorite apple, the beautiful Northern Spy. THE FUSICLADIUM is a parasitic fungus—that is, it belongs to that class which preys upon living substances, and not upon dead matter, like the mushroom ; and in order that no confusion of terms may arise, Mr. Crawford advises horticul
. The Canadian horticulturist [monthly], 1887. Gardening; Canadian periodicals. 104 THE CANADIAN HORTICULTURIST, According to Prof. Penhallow, of Quebec, 90 per cent, of the fruit of the Walbridge apple was worthless from the scab last year in that province. And now, with great dismay, we notice that it is attacking our favorite apple, the beautiful Northern Spy. THE FUSICLADIUM is a parasitic fungus—that is, it belongs to that class which preys upon living substances, and not upon dead matter, like the mushroom ; and in order that no confusion of terms may arise, Mr. Crawford advises horticulturists the world over to call it, not spot, rust, scab, or mildew, but Fusicladium. The plant, for such it really is, is so minute, that it can only be examined by a good lens, and the seed spores are so very tiny that Prof. Crawford tells us it would take 3,200, side by side, to reach one inch. How these seed spores are preserved through the winter, is still an open question, but such minute bodies would easily be carried about in the air in early spring, and settling upon a leaf or young apple begin quickly to germinate in favorable weather. The spore sends out a slender tube, which, according to Prof. Trelease, of Wiscon- sin, is probably able to pierce the skin of the leaf. In case of the apple itself, he thinks it might find entrance through one of the little dots, for over it the outer skin is often s|)lit. As soon as it sTfiins entrance, this tube begins to l>ranch out, and tlnis form the myce- lium, or that part which corresponds to roots, and this, as it grows, burst open the epidermis, or outer skin, and throws up little brown threads, or stems. These grow up to a certain height, and each produces a single spore. We copy from the plates in Mr. Crawford's Report the illustrations shown below, which may help our readers to undei'stand the growth of this fundus. Fig. 1 represents a section of the apple scab magnified 200 diameters;. —Section of an apple scab. a s
Size: 2221px × 1126px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookpublis, booksubjectcanadianperiodicals, booksubjectgardening
