(109) 



Paine, S. G. „Blackleg" of the potato. (Journ. Agric. Sci. VIII [1917], p. 480—494.) 



Parker, J. H. Greenhouse experiments on the rust resistance of oat varieties. (U. S. 

 Dept. Agric. Washington Bull. Nr. 629 [1918], 16 pp.) 



Parrot, P. J. and Glasgow, H. The radish maggot. (Bull. New York Agric. Experim. 

 Stat. Geneva Nr. 442 [1917], p. 693—715, ill.) 



Peltier, G. L. Susceptibility and resistance to Citrus-canker of the wild relatives. 

 Citrus fruits and hybrids of the genus Citrus. (Journ. Agric. Research Washington 

 XIV [1918], p. 337—357, 4 Pis.) 



— and Neal, D. C. Overwintering of the Citrus-canker organism in the bark tissue 

 of hardy Citrus hybrids. (Ibidem p. 523—524, 1 PI.) 



Pethybridge, G. H. and Lafferty, H. A. A disease of flax seedlings caused by a species 

 of Colletotrichum and transmitted by infected seed. (Sc. Proceed, roy. Dublin 

 Soc. XV [1918], Nr. 30.) 



Peyronel, B. Spondylocladium atrovirens, ein fur Italien neuer Schmarotzer der 

 Kartoffelknollen. (Internat. agrar.-techn. Rundsch. VIII [1917J, p. 835—836.) 



Piemeisel, F. J. Factors affecting the parasitism of Ustilago Zeae. (Phytopathology 



VII [1917], p. 294—307.) 

 Pipal, F. J. The effect of hydrogen peroxide in preventing the smut of wheat and 



oats. (Proceed. Indiana Acad. Sci. [1916] 1917, p. 378—381.) 

 Poeteren, N. van. Bestrijding van den eikenmeeldauw. (Tijdschr. Plankenz. XXIV 



[1918], p. 83—101.) 

 Pole, Evans, I. B. Teff rust. (Kew Bulletin 1918, p. 228—229, ill.) 

 Pool, V. W. und M. B. Das Auftreten von Cercospora beticola im Zusammenhang 



mit den Bewegungen der Spaltoffnungen. (Intern, agrar.-techn. Rundsch. VII 



[1916], p. 529.) 

 Porter, A. A. and Goons, G. W. Differences between the species of Tilletia on wheat. 



(Phytopathology VIII [1918], p. 106—113, 4 Fig.) 

 Preissecker, K. In Dalmatien in den Jahren 1914, 1915 und 1916 aufgetretene Schad- 



linge und Krankheiten des Tabaks. (Fachl. Mitteilgn. k. k. osterr. Tabakregie 



[1917], p. 21—25.) 

 Pujiula, J. Effectos del frio en las hojas de Ficus elastica. (Treballs Inst. Catalana 



Hist. nat. [1917], p. 275—282, ill.) 

 Puttemans, A. Notes phytopathologiques et mycologiques. (N. P.) (Bruxelles 1918.) 

 Ramsbottom, J. K. Training in plant pathology. (Transact, british mycol. Soc. V 



[1916], p. 378—380.) 



— Investigations on the Narcissus disease. (Journ. roy. hort. Soc. London XLIII 



[1918], p. 51—64, 12 PI.) 

 Rands, R. D. Alternaria on Datura and potato. (Phytopathology VII [1917], p. 



327—338, 4 Fig.) 

 Rebbann. Absterbende SchwarznuBbaume. (Allgem. Forst- u. Jagdzeitg. XCIII 



[1917], p. 217—227.) 

 Reddiek, D. Effect of soil temperature on the growth of bean plants and on their 

 susceptibility to a root parasite. (Americ. Journ. of Bot. IV [1917], p. 513 — 519.) 



— Lightning injury to grape vines. (Phytopathology VIII [1918], p. 298.) 

 Report 1918 of the Chief Editor. (Phytopathology VIII [1918], p. 182—190.) 

 Report of the conference on diseases of potatoes and seed certification. War Emergency 



Board-American Plant Pathologists. (Buffalo, N. Y. 1918, 21pp. 4°.) 

 Rhoads, A. S. Some new or little known hosts for wood -destroying Fungi II. (Phyto- 

 pathology VIII [1918], p. 164—167.) 



