. Diseases of economic plants . Plant diseases. 230 DISEASES OF ECONOMIC PLANTS Black mold (Alternaria Brassicoe (Berk.) Sacc). — The affected spots are nearly black, marked concentrically, are circular, and are not definitely bordered, i.e., they shade off gradually into the surrounding healthy tissue.. Fig. 108. — Collard black mold as seen from upper side of the leaf. Original. They enlarge sometimes to 2-3 cm. in diameter. The tissue dries, becomes brittle, and often falls away, leaving ragged holes. The general appearance of the spot as seen from above is pale green; as seen from the lowe

. Diseases of economic plants . Plant diseases. 230 DISEASES OF ECONOMIC PLANTS Black mold (Alternaria Brassicoe (Berk.) Sacc). — The affected spots are nearly black, marked concentrically, are circular, and are not definitely bordered, i.e., they shade off gradually into the surrounding healthy tissue.. Fig. 108. — Collard black mold as seen from upper side of the leaf. Original. They enlarge sometimes to 2-3 cm. in diameter. The tissue dries, becomes brittle, and often falls away, leaving ragged holes. The general appearance of the spot as seen from above is pale green; as seen from the lowe Stock Photo

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. Diseases of economic plants . Plant diseases. 230 DISEASES OF ECONOMIC PLANTS Black mold (Alternaria Brassicoe (Berk.) Sacc). — The affected spots are nearly black, marked concentrically, are circular, and are not definitely bordered, i.e., they shade off gradually into the surrounding healthy tissue.. Fig. 108. — Collard black mold as seen from upper side of the leaf. Original. They enlarge sometimes to 2-3 cm. in diameter. The tissue dries, becomes brittle, and often falls away, leaving ragged holes. The general appearance of the spot as seen from above is pale green; as seen from the lower surface, shown in Fig. 108, it is densely black, strongly contrasting with. 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 work.. Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York : Macmillan

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