256 P- Sydow: Pilze (ohne die Schizomyceten und Flechten). [128 



981. Norton, John Bitting Smitli. Tomate blight. (Rept. Maryland 

 State Hort. Soc. 17 th Ann. Meeting 1914, ersch. 1915, p. 85—89.) 



982. Norton, W. Preliminary note on a disease of Carica 

 papaya. (Agric. News, Barbados, XIV, 1915, p. 174.) 



983. Nowell, William. Diseases o tlie cotton plant in tlie 

 West Indies. (Imp. Dept. Agric. West Tndies Pamphlet Nr. 74, 1914, p. 94 

 bis 109, fig. 32—35.) 



984. O'Byrne, F. M. Tlie danger of C/frus canker. (Florid.x Grower 

 XII, Nr. 22, 1915. p. 12—13.) — Pseudomonas Cltris. 



985. O'Gara, P. J. A bacterial disease of western wheat-grass. 

 First account of the occurrence of a new tyj)e of bacterial 

 disease in America. (Science, N. S. XLII, 1915, p. 616—617.) — Be- 

 merkungen über eine Erkrankung von Agropyrum, die in mancher Beziehung 

 an diejenige bei Dact} lus durch Aplanob acter Rathayi hervorgerufene erinnert. 



986. O'Gara, P. .T. Occurrence of the bacterial disease of 

 Sudan grass in the Salt Lake Valley, Utah. (Science, N. S. XLII, 

 1915, p. 314—315.) — Betrifft Bacillus Sorghi. 



987. O'Gara, P. J. Some factors in the control of pear blight, 

 (Better Frixit IX, Nr. 6, Decbr. 1914, p. 13—15.) 



988. Orton, C. R. The newer diseases of fruit trees and latest 

 development in their treatment. (Proceed. Ann. Com. Fruit Growers' 

 Assoc. Adams Co., Pennsylvania IX, 1913, p. 77 — 89. 5 Fig.) 



989. Orton. Clayton Roberts. Some orchard diseases and their 

 treatment. (Proceed. State Hort. Assoc. Pennsylvania LV, 1914, p. 43—66, 

 c. fig.) 



990. Orton, G. R. and Adams, J. F. Collar blight and related 

 lorms of fire blight. (Pennsylvania Agric. Exper. Stat. Bull. CXXXVL 

 1915, p. 3—23, 14 Fig.) 



991. Osner, George Adin. Leaf smut of Timothy. (Doctorate in 

 Botany, Cornell University, 1915.) 



992. Ostcrwalder, A. Zur Schorfbekämpfung. (Schweiz. Zeitschr. 

 f. Obst- u. Weinbau 1915, p. 209—211.) 



993. Osterwaldor, A. Das frühzeitige Absterben der Astern. 

 (Schweiz. Obst- u. Gartenbau-Ztg. 1915, p. 272—273.) 



994. Osterwahler, A. Eine Krankheit an den Fruchtruten der 

 Himbeere. (Schweiz. Obst- u. Gartenbau-Ztg. 1915. p. 278—279.) — Didy- 

 rnella applanta Sacc. 



995. Osterwalder, A. Der £vony/n«s -Mehltau und seine Be- 

 kämpfung. (Schweiz. Obst- u. Gartenbau-Ztg. 1915, p. 339 — 341.) 



996. Osterwalder, A. Vom falschen Mehltau im Sommer 1915. 

 (Schweiz. Zeitschr. f. Obst- u. Weinbau XXIV, 1915, p. 344—347, 356— 359.\ 



997. Paffen, Franz. Schwefelkalkbrühe, ihre Wirkung auf 

 Pflanzenschädlinge. (Möller's Deutsche Gärtnerztg. XXX. 1915. p. 161 

 bis 162.) 



998. Pammel, L. H. Serious root and stalk disease ol com 

 (Jowa Agric. XV, 1914 p. 156—158.) 



999. Pammel, Louis Hermann, King, Charlotte M. and Seal. J. I. 

 (^orn stalk and com root diseases in Jowa. (Jowa Agric. Exper, 

 Stat. Circ. Nr. 21, 1915, 8 pp., 2 fig.) — New disease of stalk, cause undeter- 

 mined; root diseases; cornstalk disease in cattle. 



