I 
(147) 
Orton, W. A. Environmental influences in the pathology of Solanum tuberosum. 
Washingt 
190, Fig. 1—3.) 
Pammel, L. H., Knig, Charlotte M. and Seal, J. L. Corn stalk and corn root diseases 
in Jowa. (Jowa Stat. Circ XXI [1915], 8 pp., 2 Figs.) 
Parker, J. R. Influence of Soil Moisture unon the Rafp ni TnrrAncA ir. Q„rv^* 
innuence ot boil Moisture upon tlie Rate of Increase in Sugar-Beet 
Root-Louse Colonics. (Journ. Agricult. Research Washington Vol IV [19151 
p. 241—250.) 
Pethybridge, G. H. Investigations on Potato diseases. (Journ. Dept. Agric. and 
Techn. Inst. Ireland XV [1915], p. 491—526.) 
Pieper, H. Frostschaden und ihre Verhiitung. (Sachs, landw. Zeitschr. [1914], p. 68.) 
Pierce, R. G. The present status of the chestnut bark disease in JIassachusetts. (Ar- 
borea I [1914], p. 8—9.) 
Pierce, W. D wight. Some Sugar-Cane Root-Boring Weevils of the West Indies. 
(Journ. Agricult. Research Washington Vol. IV [1915]. p. 255—263 Plates 
XXXVIII.) 
Pietsch, Wilh. Beitrage zur Kenntnis der durch Tiichoseptoria fructigena Maubl, 
hervorgerufenen Krankheit der Quitten und Apfel. (Landw. Jahrb. XLVII 
[1914], p. 303—323, 13 Textabb.) 
Pollacci, Gino. II parassita dell rabbia e la Plasmodiophora brassicae Woron. Ricerche 
sui lore rapporti di affinita morfoiogica e fisiologica. Nota prel. (Atti 1st. Bot. 
Univ. Pavia Ser. 2 Vol. XIV [1914], p. 403—407.) 
Potter, A. A. The loose kernel smut of Sorghum. (Phytopathology V [I9I5], 
p. 149—154, 1 PL, 2 Fig.) 
Prizer, J. A. Some experiments in treating citrus trees for gummosis and heart rot. 
(Mo. Bull. Com. Hort. Calif. IV [1915], no. 1, p. 7—19, 7 Figs.) 
Rankin, W. H. Thrombotic disease of maple. (Phytopathology IV [1914], no. 6, 
p. 395—396.) 
Rant, A. "Ober die Mopokrankheit junger Cinchonapflanzen und uber den java- 
nischen Vermehrnngspilz. (Bull. Jard. Bot. Buitenzorg 2. Ser. XVIII [1915], 
21 pp., Fig. 1—8.) 
Reddick, D. Methods for controlling fungus diseases of the apple in New York State. 
(Conn. Pomol. Soc. Proceed. XXII [1913], p. 30—46.) 
Reed, G. M. Grain smut infections and control. (Missouri Sta. Bull. CXXXI [1915], 
p. 469.) 
Physiological relations of powderj- mildews to their hosts. (Missouri Sta. Bull. 
CXXXI [1915], p. 469—470.) 
Reed, H. S. and Crabill, C. H. The cedar rust disease of apples caused by Gymno- 
sporangium Juniperi-Virginianae Schw, (Techn. Bull. Virginia Agric. Experim. 
Stat. IX [1913], 106 pp., 23 Fig.) 
Notes on plant diseases in Virginia obser\ ed in 1913 and 1914. (Techn. Bull. 
Virg. Agr. Exp. Stat. [1915], p. 2.) 
- Respiration in apple leaves infected with Gymnosporangium. (Science N. S. 
XLI [1915], p. 180.) 
Rees, H. L. Diseases of potatoes II, III. (Washington Stat. West Wash. Sta. Mo. 
9—16, 7 Figs.; no. 7, p. 14—16.) 
6—9 
Fire blight of pear and apple. (Ibidem I [1913], no. 4, p. 
Experimental spraying for blackberry anthracnosc. (Washington Stat. West 
Wash. Stat. Mo. BuU. II [1914], no. 6, p. 2—12, 5 Figs.) 
Reimer, F. C. Blight resistance in pears and pear stocks. (Monthly Bull. State Com. 
145—149 
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