( 86 ) 
Tunkel. Die graue Ackerschnecke (Ackeregelschnecke). (Flugblattsamml. iiber 
Pflanzenschutz. Bonn-Poppelsdorf 1914, 3 pp., 4 Fig. 8°.) 
Tunstall, A. C. Fungi parasitic on the tea plant in Northeast India III, IV. (Indian 
Tea Assoc. Sci. Dept. Quart. Journ. [1914], p. 52 — 54; p. 96 — 98.) 
Tuttle, M. L. Fern trips in Virginia. (Amer. Fern Journ. V [1915], p. 108 — 113.) 
Uzel, Heinr. Uber die Blattlaus Aphis papaveris F., einen Schadling der Zuckerriibe. 
(Blatter f. Zuckerriibenbau [1915], p. 93 — 97; p. 107 — 109.) 
Valleau, W. D. Varietal resistance of plums to brown-rot. (Journ. Agricult. Research, 
Washington Vol. V ri9151, p. 365—395. Plates XXXVII— 
•) 
Verslag van de commissie, ingesteld door den Nederlandschen tuinbonwraad tot 
onderzoek van middelen ter bestrijding van den amerikanischen kruisbessen- 
meeldauw. (Tuinbouw III [1915], p. 301 — 304.) 
Victorin, M. A propos de la pigmentation pathologique des feuilles et des fleurs de 
certaines especes d’aubepine. (Le Naturaliste Canadien XLI [1915], p. 161 — 165.) 
De Vries-de Vries, M. Zur Kenntnis der Galle von Trigonaspis synaspis Hart. (Tijdschr. 
voor Entomol. Deel LVIII [1915], p. 140—149, 1 Taf.) 
W, Aufkochung von Tomatenblattern zur Bekampfung von Pflanzenschadlingen. 
(Der westdeutsche Landwirt Nr. 7 [1915], p. 27.) 
Wagner, J. Wasserstoffionenkonzentration und natiirliche Immunitat der Pflanzen. 
(Centralbl. f. Bakt. usw. II. Abt. Bd. XLIV [1916], p. 708—719.) 
Wahl, Bruno. Die Bekampfung der Graseule [Charaeas graminis L.]. 
(Mitt. d. k. k. landw.-bakt. u. Pflanzenschutzstat. Wien 1915, 3 pp., 3 Fig. 8°.) 
Wahl, C. v. und Muller, K. Bericht der Hauptstelle fiir Pflanzenschutz in Baden 
an der GroBherzogl. landwirtsch. Versuchsanst. Augustenberg fiir das Jahr 1914. 
(Stuttgart 1915, 56 pp. 8°.) 
Waite, M. B. Stigmonose: A disease of fruits. (Phytopathology IV [1914], 
p. 402.) 
Waldron, R. A, Physiological studies on the chestnut blight disease. (Ann. Rep. 
Pennsylvania Agric. Exp. Stat. 1912—1913 [1914], p. 152—156, Fig. 1—4, I— IV.) 
Weidner, J. Wie laBt sich das Fusarium bekampfen ? (Illustr. landw. Zeitg. Nr. 53 
[1915], p. 351—352. Mit Abb.) 
Weir, J. R. Telial stage of Gymnosporangium tubulatum on Juniperinus scopulorum. 
(Phytopathology V [1915], p. 218.) 
Observations on the pathology of the jack pine. (U. S. Dept. Agr. Bull. no. 212 
[1915], 10 pp., 1 PL, Fig. 1—4.) 
Larch Mistletoe: Some economic considerations of its injurious effects. (U. S. Dept, 
of Agric. Washington Bull. no. 317, Contrib. from the Bur. of Plant Industry 
[January 1916], 25 pp., 13 Figs.) 
Weir, Janies R. and Hubert, Ernest E. A serious disease in forest nurseries caused 
by Peridermium filamentosum. (Journ. Agricult. Research Washington Vol. V 
[1916], p. 781—785.) 
Wenck, Fr. Schlechte Erfahrungen mit der Schwefelkalkbriihe. (Erfurter Fiihrer 
im Obst- u. Gartenbau XV [1914/15], p. 289—290.) 
Westerdijk, Johanna. Phytopathology in the tropics. (Annals Missouri Bot. Gard. II 
[1915], p. 307—313.) 
Whetzel, H. H. Diseases of the peony. (Transact. Massachus. Hort. Soc. 1915, 
p. 103—112 
2 .) 
Co-operation in the control of fruit diseases in New York. (Ann. Rep. Maine 
Comm. Agr. XII [1915], p. 3 — 15.) 
Ginzeng and its diseases. (Ontario Nat. Sci. Bull. VII [1912], p. 22—28, 4 Figs.) 
