. 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 Artnoracioe 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 Artnoracioe 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
Size: 2025px × 1234px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
