. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 367 fully as a preventive. Five or more sprayings have been profitable upon American, French, and Japanese stocks, although this has not afforded complete protection. Spraying as for the pear scab is advised when this disease becomes a matter of suffi- cient economic importance in the Fig. 186. Spores of the Entomusporium LIV. SOOTY BLOTCH AND FLY SPECK OF THE APPLE AND OTHER PLANTS1 Leptothyrium Pomi (Mont. & Fr.) Sacc. Clinton, G. P. Notes on Parasi
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 367 fully as a preventive. Five or more sprayings have been profitable upon American, French, and Japanese stocks, although this has not afforded complete protection. Spraying as for the pear scab is advised when this disease becomes a matter of suffi- cient economic importance in the Fig. 186. Spores of the Entomusporium LIV. SOOTY BLOTCH AND FLY SPECK OF THE APPLE AND OTHER PLANTS1 Leptothyrium Pomi (Mont. & Fr.) Sacc. Clinton, G. P. Notes on Parasitic Fungi. Fly Speck. Sooty Blotch. Conn. Agl. Exp. Sta. Rept. (1903): 299-302. Powell, G. H. A Fungous Disease of the Apple. Garden and Forest 9: 474-475- Selby, A. D. Sooty Fungus and Fly Speck Fungus. Ohio Agl. Exp. Sta. Built. 79: 133-134. Sturgis, W. C. On the Cause and Prevention of a Fungous Disease of the Apple. Conn. Agl. Exp. Sta. Rept. 21 : 171-175. According to the unpublished observations of Floyd the sooty blotch and fly speck are apparently stages of the same fungus. They are almost invariably associated upon the host (Fig. 187), but may occupy distinct areas upon the same portion of the plant. They seem to occur upon the fruit of the apple throughout the limits of its culture. A sooty blotch and a fly speck are also found upon the pear, and along a roadside near Columbia, Mo., there were found more than twenty-five hosts affected by what was apparently the same fungus. These plants were all woody in tex- ture, and the fungus occurred generally on the younger twigs and petioles. The forms upon these hosts may be provisionally referred to as one fungus. Observation indicates that the organ- ism is most abundant under conditions of considerable moisture, half shade, and abundant dust. The market value of apples is affected by the discolorations which result. 1 For the material of this account I am very largely indebted to unpublished data kindly furnished by Mr. B.
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Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
