. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. j66 DISEASES OF CULTIVATED PLANTS their brown colour are apt to be overlooked, even when abundant. Ascophore 1-3 cm. across, stem 2-7 cm. long; spores Sin anascus, elliptical, 15-18x6-7 /x. Collecting the ascophores tends to check the disease. Sclerotimn disease {Sclerotinia sckrotiorum, Massee) is probably parasitic on a greater number of different kinds of plants than any other fungus, members of all the families of cultivated plants being attacked. Wh
. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. j66 DISEASES OF CULTIVATED PLANTS their brown colour are apt to be overlooked, even when abundant. Ascophore 1-3 cm. across, stem 2-7 cm. long; spores Sin anascus, elliptical, 15-18x6-7 /x. Collecting the ascophores tends to check the disease. Sclerotimn disease {Sclerotinia sckrotiorum, Massee) is probably parasitic on a greater number of different kinds of plants than any other fungus, members of all the families of cultivated plants being attacked. White and swede turnips, cabbages, carrots, broad and haricot beans, potatoes, cucum-. I % Fig. 78.—Sclcroiiniii sileroliorum. i, part of a chrysanthemum stem with black scleiotia of the fungus ; 2, a sclerotium bearing five ascigerous fruits ; 3, ascus with spores. Figs. 2 and 3 mag. bers, melons, hemp, petunias, zinnias, and chrysanthemums being among the number of its victims. The disease com- monly attacks the stem, commencing as a white mould at the ground-line and working upwards. When the parasite has been at work for some time tiie leaves turn yellow and wilt, and finally the stem collapses, death being due to lack of food and water, owing to the mycelium of the fungus having choked up the vessels, and thus retarded the passage of water up the stem. When the stem is hollow the mycelium is pro- duced in considerable quantity in the cavity, and forms large. 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 Massee, George, 1850-1917. New York : Macmillan
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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
