. Diseases of economic plants. Plant diseases. 304 DISEASES OF ECONOMIC PLANTS. Fig. 133.—Tobacco leaf showing leaf spot (cercosporose). After Conn. Exp. Sta. The disease was first described by Sturgis ^ from specimens sent from South CaroHna. It was then very destructive, practically ruining the crop. A damage of $1000 to one crop alone was noted. It has since con- tinued as a troublesome pest. The use of Bordeaux early in the season is per- missible and advanta- geous. White speck (Macro- sporiwn tabacinum Ell. & Ev.). — White speck con- sists of small, circular spots, rusty red or brown
. Diseases of economic plants. Plant diseases. 304 DISEASES OF ECONOMIC PLANTS. Fig. 133.—Tobacco leaf showing leaf spot (cercosporose). After Conn. Exp. Sta. The disease was first described by Sturgis ^ from specimens sent from South CaroHna. It was then very destructive, practically ruining the crop. A damage of $1000 to one crop alone was noted. It has since con- tinued as a troublesome pest. The use of Bordeaux early in the season is per- missible and advanta- geous. White speck (Macro- sporiwn tabacinum Ell. & Ev.). — White speck con- sists of small, circular spots, rusty red or brown at first, but later with blanched centers, upon which the scattered hy- phiie grow. Brown spot (Macro- sporium longipes Ell. & Ev.).—This spot differs from the above in its rusty brown color and in having Sturgis, W. C, Conn. State Agr. Exp. Sta. Rpt. 20, p. 273, 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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