312 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



43. Malthouse, G. T. Newport Advertiser, Dec. 25, 1909. 



44. Suppl. Bull, to Annual Report, 1909, Harper Adams Agr. Coll. 



45. Bull. Harper Adams Agr. Coll. (Nov. 1910). 



46. Harper Adams Agr. Coll. (Bull. 8, 1914). 



47. Marlatt. Rep. Fed. Hort. Bd., U.S. Dept. of Agr., Oct. 1919. 



48. Massee, G. Jour. Bd. Agr. ix. p. 307 (Dec. 1902). 



49. Gard. Chron. xxxiii. p. 258 (April 1903). 



50. A Text-book of Plant Diseases. 



51. Proc. Linn. Soc. Lond. (Dec. 17, 1908), p. 6 (1909). 



52. Diseases of Cultivated Plants and Trees, pp. 98, 573 (1910). 



53. Gard. Chron. xxxiv. p. 417 (Dec. 19, 1903). 



54. Orton & Field. U.S. Dept. of Agr., Circ. 52, March 1910. 



55. Orton & Kern. Pennsylvania State College, Bull. 156, March 191 9. 

 50. Percival, J. Gard. Chron. xlvi. p. 79, July 31, 1909. 



57. Centr.fiir Bakt. Abt. II., Bd. 25, p. 440 (1910). 



58. Potter, M. C. Jour. Bd. Agr. ix. p. 320 (Dec. 1902). 



59. Jour. Newcastle Farmers' Club (1908). 



60. Quanjer. Mededeelingen van der Rijks Hoogere land — Tuin — en Bosch- 



bouwschool, Diel ix. 1916 (abs. in Zeit. f. Pflanzenkr. Bd. 28, p. 40, 

 1918). 



61. Riehm. Illus. Landsw. Zeitung, Jg. 29, p. 415, 1909. 



62. Ibid. Jg. 36, p. 667, 1909. 



63. Salmon, E. S. Jour. S.E. Agr. Coll., Wye, No. 15, p. 230 (1906). 



64. Gard. Chron. Dec. 7, 1907, p. 397. 



65. Leaflet S.E. Agr. Coll., Wye (Jan. 1908). 



66. Jour. S.E. Agr. Coll., Wye, No. 17 (1908). 



67. — Ibid. No. 18 (1909). 



67A. Schaffnit. Veroffentl. d. Landw. Kamm. f. d. Rheinprov. 1915, p. 26 

 (abs. in Centr. /. Bakt. 47, p. 563, 1917). 



68. Schaffnit & Lustner. Zeit. f. Pflanzenkr. Bd. 26, p. 195, 1916. 



69. Ibid. Bd. 28, p. 28, 1918. 



70. Schaffnit & Voss. Zeit. f. Pflanzenkr. Bd. 26, p. 183; 1916. 



71. Ibid. Bd. 27, p. 339, 1917. 



72. Ibid. Bd. 28, p. in, 1918. 



73. Schilberszky. Berichte der Deutsch. Bot. Gesellsch. xiv. 1896. 



74. Schneider. Deutsche Landw. Presse, Bd. xxxv. 1908. 



75. Schoyen. (Outbreak near Christiania, 1914) Abs. in Zeit. f. Pflanzenkr. 



Bd. 27, 1917. 



76. (Abs. in Zeit. f. Pflanzenkr. Bd. 28, p. 31, 1918). 



77. Snell, J. Food Production Leaflet 21, Oct. 191 7. 



78. Supp. 18, Jour. Bd. Agr. March 1918. 



79. Sutton. Jour. R.A.S.E., ser. 3, ix. p. 599, 1898. 



80. Spaulding & Field. Farmers' Bull. No. 489, 191 2. 



81. Spieckermann. Prakt. Blatt. f. Pflanzenbau. Bd. vi. 1908. 



82. Ber. u. d. Tatigk. d. landw. Versuchsstat. Miinster i. W. 1908, p. 32. 



83. III. Landw. Ztg., Bd. 34, 1914 (abs. in Centr. f. Bakt. Bd. 41, 1914). 



84. Stift, A. Centr. f. Bakt. Bd. 26, p. 553, 1910. 



85. Weiss. Nature, Nov. 26, 1908. 



86. Werth, E. Deutsche Landw. Presse, Jg. 42, 1915 (abs. in Centr. f. Bakt. 



Bd. 47, 1917). 



87. Bericht ii. d. Tatigkeit der Biol. Reichsanstalt. f. Land. u. Forstw. Heft 



17 (1919). 



88. Wilson, J. H., D.Sc. Dundee Advertiser, April 21, 1908. 



89. Zimmermann. Bericht. d. Hauptsammelstelle f. Pflanzenschutz. . . . fur 



1915 (abs. in Zeit. f. Pflanzenkr. Bd. 27, p. 292, 1917). 



90. Mitt. d. Landw. Versuch. Stat., Rostock, 1915 (abs. in Centr. /. Bakt. 



Bd. 47, 1917). 



