. The fungi which cause plant disease . Plant diseases; Fungi. 502 THE FUNGI WHICH CAUSE PLANT DISEASE About two hundred species several of them important plant pathogens. S. malorum Pk.«°' "â ""'^ Mycelium sooty-brown; pycnidia erumpent, usually surrounded by broken epidermis, apically somewhat depressed; conidia oblong elliptic, broAvn, usually about twice as long as broad, 22-32 x 10-14 H, varying in size with host and part attacked. On apple, pear, quince, hawthorn; on twigs causing canker or blight; on fruit causing rot and on leaves causing iiu. 34S.âS. malorum,
. The fungi which cause plant disease . Plant diseases; Fungi. 502 THE FUNGI WHICH CAUSE PLANT DISEASE About two hundred species several of them important plant pathogens. S. malorum Pk.«°' "â ""'^ Mycelium sooty-brown; pycnidia erumpent, usually surrounded by broken epidermis, apically somewhat depressed; conidia oblong elliptic, broAvn, usually about twice as long as broad, 22-32 x 10-14 H, varying in size with host and part attacked. On apple, pear, quince, hawthorn; on twigs causing canker or blight; on fruit causing rot and on leaves causing iiu. 34S.âS. malorum, 6, dark colored mycelial threads among the cells of the fruit; d, a pycnidium, which has pushed through tlie epi- dermis, c, and is giving off dark colored spores, e; Bf mature spores germinating in water. After Longyear. This is one of the common causes of pomaceous fruit rots and of leaf spot in the United States. Its occurrence in leaf spots was noted in 1898," and in 1902 Clinton *° recognized it as their cause. Cultures were obtained from diseased leaf spots bj^ Scott & Rorer "° and by inoculations the ability of the fungus to cause spots was definitely proved. This fungus was reported by Paddock ^^ as the probable cause of apple twig blight and canker and cross inoculation between twigs and fruit proved the identity of the fungus on these two parts. The mycelium is very dark or olivaceous and abounds in the rotten pulp of affected fruit, also in diseased bark, and is even. 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 Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
