Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom00stev Year: 1910 230 DISEASES OF ECONOMIC PLANTS Black mold {Alternaria Brassicoe (Berk.) Sacc). â The affected spots are nearly black, marked concentrically, are circular, and are not definitely bordered, , they shade off gradually into the surrounding healthy tissue. Fig. 108. â CoUard 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
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom00stev Year: 1910 230 DISEASES OF ECONOMIC PLANTS Black mold {Alternaria Brassicoe (Berk.) Sacc). â The affected spots are nearly black, marked concentrically, are circular, and are not definitely bordered, , they shade off gradually into the surrounding healthy tissue. Fig. 108. â CoUard 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
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