Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 304 DISEASES OF ECONOMIC PLANTS The disease was first described by Sturgis1 from specimens sent from South Carolina. 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- sporium tabacinum Ell. & Ev.). — White speck con- sists of small, circular spots, rusty red or brown at first, but later with blanch
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 304 DISEASES OF ECONOMIC PLANTS The disease was first described by Sturgis1 from specimens sent from South Carolina. 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- sporium 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- phse grow. Brown spot (Macro- sporium longipes Ell. & Ev.). — This spot differs from the above in its rusty Fig. 133.—Tobacco leaf showing leaf spot . . . . (cercosporose). After Conn. Exp. Sta. brOWn Color and in having 1 Sturgis, W. C, Conn. State Agr. Exp. Sta. Rpt. 20, p. 273, 1896.
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