100 .4 Phytophthora Rot of Pears and Apples 



produced; frequently the skin splits and the mycelium of the fun^ius is 

 seen on the exposed surface as a whitish bloom. 



To keep the disease in check rotting fruit, whether on the ground or 

 still on the tree, should be collected and destroyed. 



BIBLIOCRAPHV. 



(1) BuBAK, E. Die Phytophthorafaule der Biriien in Bohmen. Zeitschr. f. Ffav- 



zenkr. Bd. xx, pp. 257-26], 1910. 



(2) Dastur, J. F. On Phytophthora parasitica nov. spec, a new diseasf of the 



Castor Oil Plant. Mem. Dept. Agr. India, Bot. Ser. vol. v, No. 4, pp. 177- 

 231, May, 1913. 



(3) Marchal, E. Sur une maladie nouvelle du Poirier. Bull. Hoc. Roy. de BeJgique, 



45, pp. 343-344, 1908. 



(4) OsTERW ALDER, A. Die Phylophthora-YixnlQ beim Kernobst. Cent. f. Bakt. Abt. 2, 



Bd. XV, pp. 435-440, 1906. 



(5) Von der Obstfaulnis am Baume. Schweizer Zeitschr. f. Ohsl- v. Weinb. 



pp. 261-265, 1912. 



(6) Landw. Jahrh. d. Schweiz, xxvi. No. 6, pp. 321-322, 1912 (Abs. in Exp. 



Sta. Rec. vol. xxvni. No. 1, p. 54, Jan. 1913). 



(7) Pethybridge, G. H. On the Rotting of Potato Tubers by a new species of 



Phytophthora having a method of Sexual Reproduction hitherto unde- 



scribed. Sci. Proc. Roy. Dublin Sac. vol. xni, (N.S.), No. 35, pp. 529-565, 



March, 1913. 

 (8) and Lafferty, H. A. A Disease of Tomato and other Plants caused by 



a New Species of Phytophthora. Sci. Proc. Roy. Dublin Soc. vol. xv, (N S.), 



No. 35, pp. 487-505, Feb., 1919. 

 (9) Robinson, W. "Black Neck" or Wilt Disease of Asters. Ann. Applied Biol. 



vol. II, Nos. 2 and 3, pp. 125-137, 1915. 



(10) RosENBAUM, J. Studies of the genus Phytophthora. Jour. Agr. Res. \o\. \ni, 



No. 7, pp. 233-276, Feb., 1917. 



(11) ScHOEVERS, T. A. C. Het Phytophthora-Rot der Pitvruchten. Tijdschr. 



Plantenziekten, 21 Jaarg. No. 5-6, pp. 153-159, 1915. 



( 12) Cnamuno, L. Los estragos de la Phytophthora Cactorum en las peras y ciruelas. 



Espana y America, 1910 (Abs. in Ze//.;. /. Pflanzenkr. Bd. xxi, p. 379, 

 1911). 



(13) Whetzel, H. H. and Rosenbatjm, J. The Phytophthora rot of apples. Phylo- 



path. voi. VI, No. 1, pp. 89-90, Feb., 1916. 



DESCRIPTION OF PLATE III 



Fig. 1. A pear G days aftiM' iiioculatinn with myioiiuiii of I'liijloplitliura Citrtoruin tak 



from a pure culture. 

 Fig. 2. The same 3 days later; by this time .sporangia had developed. 

 Fig. 3. Ap|»l('s (var. Lane's Prince Albert) affected with the Phytdphthnia rot. 



