. Annual report of the Cornell University Agricultural Experiment Station, Ithaca, Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 330 Bulletin 263. improbable that this disease was referred to by Galloway ('89) as Black Knot of the grape, and said to be due to frost injury; by Fletcher ('89") also as Black Knot; by Woodworth ('92) as Root Knot or commonly as Black Knot. The material which Fletcher examined was sent to Dr. W. G. Farlow of Harvard University, who suggested that "the trouble, however, is climatic rather than fungous," and
. Annual report of the Cornell University Agricultural Experiment Station, Ithaca, Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 330 Bulletin 263. improbable that this disease was referred to by Galloway ('89) as Black Knot of the grape, and said to be due to frost injury; by Fletcher ('89") also as Black Knot; by Woodworth ('92) as Root Knot or commonly as Black Knot. The material which Fletcher examined was sent to Dr. W. G. Farlow of Harvard University, who suggested that "the trouble, however, is climatic rather than fungous," and perhaps due to frost injury. The frost-injury idea is a very common one. Growers commonly refer to the disease as Side Arm, Dead Arm or Black Knot. In European literature, we find numerous references to diseases of the vine. Besides root and stem diseases ascribed to Dematophora, Armillaria, and the like, there are a number of so-called physiologi- cal diseases. These are described un- der various captions such as Fol- letage, Chlorosis, Rougeot, Brous- sins, Exotoses, Fongosites, or Tu- bercoli. Viala ('93) has de- scribed and illustrated a disease, Broussins (excrescences), as due to frost injury. From descrip- tions of general appearances one might easily believe that near- ly any of the above were the same disease as the one with which we are dealing. Some of the illustrations, especially those of Viala, might be readily used to illustrate this paper, since the points of similarity are so great. ('89) Galloway, B. T. A record of some of the work of the Division. Part II, Section of Vegetable Pathology. U. S. D. A., Bot. Div. Bull. 8:63. 1889. ('89) Fletcher, Jas. Report of the Entomologist and Botanist. Rept. Can. Exp. Farm, 1889, p. 87. ('92) Woodworth, C. W. Root Knots on Fruit Trees and Vines. Univ. Cal. Agr. Exp. Sta. Bull. 99:1-4, 1892. ('93) Viala, P. Les Maladies de la Vigne, Troisieme edition 1893. I. c. p. 489- 490, Figs. Photo. Aug. 20, 1908 Fig. 46.—
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