. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. SCLEROTINIA 269 the death of the clover. The presence of small black sclerotia partially embedded in the substance of the stem and root indicates that the injury is due to the Sckroti?iia. As a rule, only one ascophore springs from a sclerotium, at first closed then expanding, yellowish-brown 3 mm. to i cm. across, stem elongated, slender ; spores S in an ascus, hyaline, elliptical, 16-18x8-9/^. Conidial condition Fig. 79.—Sclerotinia ur7iula.
. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. SCLEROTINIA 269 the death of the clover. The presence of small black sclerotia partially embedded in the substance of the stem and root indicates that the injury is due to the Sckroti?iia. As a rule, only one ascophore springs from a sclerotium, at first closed then expanding, yellowish-brown 3 mm. to i cm. across, stem elongated, slender ; spores S in an ascus, hyaline, elliptical, 16-18x8-9/^. Conidial condition Fig. 79.—Sclerotinia ur7iula. i, chain of conidiain young stage ; 2, chain of conidia at maturity ; the narrow necks or disjunctors deliquesce, and set the conidia at liberty; 3, ascophores springing from mummified fruits ; 4, ascus with spores ; 5, paraphyses. All figs except 3 mag. This is a very difficult disease to combat; if diseased patches are observed while yet quite small in area, the clover should be cut, and after remaining for some time to dry, some dry litter should be spread over the diseased patch, and set on fire. By this means all the sclerotia are destroyed. Clover should not be sown on infected land for some years after an epidemic. A dressing of kainit is good for infected land. Cowberry sclerotinia, Sclerotinia ur?iula, Rehm. { = S. vac- cina, Woron.), produces its conidial form of fruit, under the form of a snow-white, thin mildew on the living stems and leaves of the cowberry (Vacciniuin vitis-idaea). This mildew belongs to the form-genus Oidium, and was at one. 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
