. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. HOOT CROPS. 53 22 D); and to reproductive organs (Fig. 22 F) within the host-plant. The protoplasm of the conidia either divides or gives rise to a hypha or " germ tube " (Fig. 23). When it divides it produces a number of zoospores provided with cilia (filaments) (Fig. 23 B). The zoospores float about in the atmosphere and thereby spread the disease. Ulti- mately the cilia disappear, and the zoospores settle down upon the leaves of the potato plant, giving rise to ano
. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. HOOT CROPS. 53 22 D); and to reproductive organs (Fig. 22 F) within the host-plant. The protoplasm of the conidia either divides or gives rise to a hypha or " germ tube " (Fig. 23). When it divides it produces a number of zoospores provided with cilia (filaments) (Fig. 23 B). The zoospores float about in the atmosphere and thereby spread the disease. Ulti- mately the cilia disappear, and the zoospores settle down upon the leaves of the potato plant, giving rise to another. Fig. 23.—Potato Fungus {Pcronospora iiifcstans). A. Conidium dividing. B. Conidium producing zoospores (after division). C. Conidium protruding a filament of protoplasm. D. Oosfoniurn ( 9) and antheridium (d). B. Oospore (Repting-spore). F. Oospore producing zoospores. G. Oospore germtnatinsr. (X 300 diam.) generation of mycelia. According to the late Rev. M. J. Berkeley, , the mycelium sometimes hibernates and becomes perennial. Sexual reproductive organs are formed from the cells of the mycelium within the host- plant. They are generally to be found in the inter- cellular spaces (Fig. 22 F, and Fig. 23 D). Fertilization. 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 Griffiths, A. B. (Arthur Bower), 1859-. London : G. Bell
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Keywords: ., bookauthorgriffith, bookcentury1800, bookdecade1890, bookyear1890
