. Diseases of economic plants . Plant diseases. 242 DISEASES OF ECONOMIC PLANTS ent upon horse-radish, but does not usually become serious. Leaf spot, cercosporose {Cercospora Armoracioe Sacc).— This spot is much like that of ramulariose. LETTUCE Sclerotiniose, drop, wilt (Sclerotinia Libertiana Fckl.).— The disease begins with wilting of the outer lower leaves,. Fig. 110. — Sclerotia of Sclerotinia from lettuce germinating. which droop and fall flat upon the ground; a similar fate rapidly overtakes the inner leaves, and so on over the whole plant, until within a few days the entire plant is d
. Diseases of economic plants . Plant diseases. 242 DISEASES OF ECONOMIC PLANTS ent upon horse-radish, but does not usually become serious. Leaf spot, cercosporose {Cercospora Armoracioe Sacc).— This spot is much like that of ramulariose. LETTUCE Sclerotiniose, drop, wilt (Sclerotinia Libertiana Fckl.).— The disease begins with wilting of the outer lower leaves,. Fig. 110. — Sclerotia of Sclerotinia from lettuce germinating. which droop and fall flat upon the ground; a similar fate rapidly overtakes the inner leaves, and so on over the whole plant, until within a few days the entire plant is dead, lying flat upon the ground, appearing much as though scalded by a dash of hot water. The disease progresses with wonderful rapidity, the plants appearing to die in a day. Upon the undersides and at the bases of the leaves occur,. 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; Hall, John Galentine, 1870-. New York : Macmillan
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
